a/ (2x - 7) - 135 = 0
=> 2x - 7 = 0 + 135 = 135
=> 2x = 135 + 7 = 142
=> x = 142 / 2 = 71
b/ 122 + (37 - 3x) = 0
=> (37 - 3x) = 0 - 122 = -122
=> 3x = 37 - (-122) = 159
=> x = 159 / 3 = 53
\(a)\)\((2x-7)-135=0 \)
\(2x-7=0+135\)
\(2x-7=135\)
\(2x=135+7\)
\(2x=142\)
\(x=71\)
\(b) 122+(37-3x)=0\)
\(37-3x=0-122\)
\(37-3x=-122\)
\(3x=37-(-122)\)
\(3x=159\)
\(x=159:3=53\)
\(a,\left(2x-7\right)-135=0\)
\(\Rightarrow\)\(2x-7=0+135\)
\(\Rightarrow\)\(2x-7=135\)
\(\Rightarrow\)\(2x=135+7\)
\(\Rightarrow2x=142\)
\(\Rightarrow x=142:2\)
\(\Rightarrow x=71\)
Vậy \(x=71.\)
\(b,122+\left(37-3x\right)=0\)
\(\Rightarrow\)\(37-3x=0-122\)
\(\Rightarrow\)\(37-3x=-122\)
\(\Rightarrow\)\(3x=-37-\left(-122\right)\)
\(\Rightarrow3x=159\)
\(\Rightarrow x=159:3\)
\(\Rightarrow x=53\)
Vậy \(x=53.\)
a,\(\left(2x-7\right)-135=0\)
\(\Rightarrow2x-7-135=0\)
\(\Rightarrow2x=135+7\)
\(\Leftrightarrow2x=142\Leftrightarrow x=71\)
b,\(122+\left(37-3x\right)=0\)
\(\Rightarrow122+37-3x=0\)
\(\Rightarrow-3x=-122-37\)
\(\Leftrightarrow-3x=-159\Leftrightarrow x=53\)
Chúc bạn học tốt!!!
