Question

ПЖ, СРОЧНО ПЖЖЖЖ СПС​

Answer 1

$3(-0,5 x + 3y) - 2(0,8x - z) - (2y+2z) = -1,5x + 9y - 1,6x + 2z - 2y - 2z =\\\\=\boxed{-3,1x+7y}$