(5x-3)+(7x-4)=8-(15-11x)

(4x+3)-(10x+11)=7+(13-4x)

там не 12, а 28

да 28 перепутала ответ -14

1) 5x-3+7x-4=8-15+11x 5x+7x-11x=8-15+3+4 1x=0 x=0:1 x=0 2) 4x+3-10x-11=7+13-4x 4x-10x+4x=7+13-3+11 -2x=28 x=28:(-2) x=-14

(5x-3)+(7x-4)=8-(15-11x)5x-3+7x-4=8-15+11x5х+7х=11х=3+4+8-15х=0(4x+3)-(10x+11)=7+(13-4x)4x+3-10x-11=7+13-4x4х-10х+4х=11-3+7+13-2х=12х=6