x-(7-8x)=3(x-2)
x-7+8x=3x-6
x+8x-3x=-6+7
6x=1
x=6分之1
x-2[x-3(x-1)]=8
x-2(x-3x+3)=8
x-2(-2x+3)=8
x+4x-6=8
5x=14
x=2.8