`-15 + 19x = 9 + 7x`

`=> 12x = 24`

`=> x = 2`.

\(x+3+7x-19x=38\)

               \(-11x+3=38\)

                       \(-11x=38-3\)

                       \(-11x=35\)

                                \(x=-\frac{35}{11}\)

x=-35/11

\(...\Rightarrow\left(19x+50\right):14=5^2-4\Rightarrow\left(19x+50\right):14=21\Rightarrow\left(19x+50\right)=21.14\)

\(\Rightarrow19x+50=294\Rightarrow19x=244\Rightarrow x=\dfrac{244}{19}\)

\(\left(19x+2.5^2\right):14=\left(13-8\right)^2-4^2\)
\(\Rightarrow\left(19x+50\right):14=5^2-4^2\)
\(\Rightarrow\left(19x+50\right):14=9\)
\(\Rightarrow19x+50=126\)
\(\Rightarrow19x=76\)
\(\Rightarrow x=4\)
Vậy x = 4
#Kễnh

(x³ - 4x² - 3x² + 12x + 2x - 8 =0
 x²(x - 4) - 3x(x - 4) + 2(x - 4) =0
 (x - 4)(x² - 3x + 2) =0
 (x - 4)(x - 1)(x - 2) =0

=>X-4=0       hoặc            x-1=0                       hoặc              x-2=0

(tự giải tiếp nhá)        

`( 19x + 2*5^2 ) : 14 = ( 13-8)^2 - 4^2`

`=> ( 19x + 50 ) : 14 = 5^2 - 4^2`

`=> ( 19x + 50 ) : 14 = 9`

`=> 19x + 50 = 9*14`

`=> 19x + 50 = 126`

`=> x = ( 126 - 50 )/19`

`=> x = 4`

Vậy `x=4` 

(19x + 2.5\(^2\) ) : 14 = 5\(^2\)- 4\(^2\)

(19x + 2.5\(^2\) ) : 14 = 9

19x + 2.5\(^2\)  = 9.14

19x + 50 = 126

19x = 126-50=76;19

x = 4

(19x+2.5²):14=(13-8)²-4²

(19x+2.25):14=5²-4²

(19x+50):14=25-16

(19x+50):14=9

19x+50=9.14

19x+50=126

19x      =126-50

19x      =76

    x      =76:19

    x      =4

\(\frac{3}{7}\left(7x+\frac{2}{3}\right)-2\left(\frac{5}{14}-3x\right)=\frac{15}{5}\)

\(\Leftrightarrow3x+\frac{2}{7}-\frac{5}{7}+6x=3\)

\(\Leftrightarrow9x=\frac{24}{7}\)

\(\Leftrightarrow x=\frac{8}{21}\)

\(\frac{3}{7}.\left(7x+\frac{2}{3}\right)-2.\left(\frac{5}{14}-3x\right)=\frac{15}{5}\)

\(\Leftrightarrow3x+\frac{2}{7}.x-\frac{5}{7}+6x=3\)

\(\Leftrightarrow\frac{65}{7}.x-\frac{5}{7}=3\)

\(\Leftrightarrow\frac{65}{7}.x=3+\frac{5}{7}\)

\(\Leftrightarrow\frac{65}{7}.x=\frac{26}{7}\)

\(\Leftrightarrow x=\frac{26}{7}:\frac{65}{7}\)

\(\Leftrightarrow x=\frac{2}{5}\)

 3/7.(7x+2/3)-2.(5/14-3x)=15/5

\(\Leftrightarrow3x+\frac{2}{7}.x-\frac{5}{7}+6x=3\)

\(\Leftrightarrow\frac{65}{7}.x-\frac{5}{7}=3\)

\(\Leftrightarrow\frac{65}{7}.x=\frac{26}{7}\)\(\Leftrightarrow x=\frac{2}{5}\)

Vậy x =\(\frac{2}{5}\)

( 19x + 2.5² ) : 14 = ( 13 - 8 )²- 4 ²

( 19x + 2.5² ) : 14 = 5²- 4 ²

( 19x + 2.5² ) : 14 = 25- 16

( 19x + 2.5² ) : 14 =9

( 19x + 50 ) : 14 =9

 19x + 50=9 . 14

 19x + 50=126

19x=126-50

19x=76

x=76:19

x=4

vbawngf 4 bạn nhé chắc chắn 100%

gan gon hon nha

(19x+2*5^2)/14=(13-8)^2-4^

(19x+2*25)/14=(13-8)^2-16

(19x+2.25)/14=5^-16

(19x+2.25)/14=25-16

(19+2.25)=9*14

19X=126+50

x=76/19

x=4