1. 3(x-4)-x=2(x-6)
3x - 12 - x = 2x - 12
2x - 12 = 2x - 12
2x - 2x = -12 + 12
0 = 0
2. 5(x+8)-6(2x-7)=5
(5x + 40) - (12x -42) = 5
5x + 40 - 12x + 42 = 5
[-7 变 就+7是因为()外面的减，减减变加]
-7x + 82 = 5
82 - 5 = 7x
77 = 7x
x = 77÷ 7
x = 11
