2x - 15 = 9
=> 2x = 24
=> x = 12
(x + 2) : 3 = 15
=> x + 2 = 45
=> x = 43
a, 2.x -15 = 9
<=> 2.x = 9 + 15
<=> 2.x = 24
<=> x = 12
Vậy x = 12
b, ( x + 2 ) : 3 = 15
<=> x + 2 = 15 x 3
<=> x + 2 = 45
=> x = 43
Vậy x= 43
a)2.x-15=9
2x=9+15
2x=24
x=24:2
x=12
Vậy x=12
b,(x+2):3=15
x+2=15:3
x+2=5
x=5-2
x=3
Vậy x=3
a,\(2x-15=9\)
\(=>2x=9+15=24\)
\(=>x=\frac{24}{2}=12\)
b,\(\left(x+2\right):3=15\)
\(=>x+2=15.3=45\)
\(=>x=45-2=43\)
a/ 2.x-15=9
2.x = 9 +15
2.x = 24
x = 24 : 2
x = 12
b/ (x+2):3 =15
(x+2) =15.3
x+2 = 45
x = 45-2
x = 43