x=7(x-12)
解:x=7x-84
7x-x=84
6x=84
x=14
X=7X-84
-6X=-84
X=14
左边=14
右边=7×(14-12)=14
左边=右边
x=7(x-12)
x=7x-84
6x=84
x=14
X=7(X-12)
X=7X-84
7X=84+X
6X=84
X=14
x=7x-12×7
x=7x-84
84=7x-x
84=6x
6x=84
x=14