5х+6у-х+у =4x+7y
2*(х+7)+4х = 2x + 14 + 4x = 6x + 14
8*(2х+5)+4*(6+7х)= 16x + 40 + 4(6 + 7x) = 16x + 40 + 24 + 28x = 44x + 64
5х+6у-х+у =4x+7y
2*(х+7)+4х = 2x + 14 + 4x = 6x + 14
8*(2х+5)+4*(6+7х)= 16x + 40 + 4(6 + 7x) = 16x + 40 + 24 + 28x = 44x + 64