(7-10х)-(8-8х)+(10х+6)=-8
7-10х-8+8х+10х+6=-8
8х+5=-8
8х=-8-5
8х=-13
х=(-13):8
х=-1 целая 5/8
(2х+3)+(3х+4)+(5х+5)=12-7х
2х+3+3х+4+5х+5=12-7х
10х+12=12-7х
10х+7х=12-12
17х=0
х=0:17
х=0
(3х+5)*(4х-1)=(6х-3)*(2х+7)
12х²+20х-3х-5=12х²-6х+42х-21
12х²-12х²+17х-36х=-21+5
-19х=-16
х=(-16):(-19)
х=16/19