5(x-3)-2(x-7)=7-7(2x+6)
5x-15-2x+14=7-14x-42
5x-2x+14x=7-42-14+15
17x=-34
x=-2
ответ -2
5х-15-2х+14=7-14х-42
5х-2х+14х=7-42+15-14
17х=-34
х=-34:17
х=-2