7(x+6)-2(x-7)=56
7x+42-2x+14=56
7x-2x=56-42-14
5x=0
x=0
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7(x+6)-2(x-7)=56
7x+42-2x+14=56
7x-2x=56-42-14
5x=0
x=0
(7х+42-2х+14)/14 = 4
5х+56 = 56
5х=0
х=0
проверка
0+6/2 - 0-7/7 = 3-(-1)=3+1=4