2•(3,6x-5)+8•(2,5-4x)= 4,2•(-5x-2y)-2,7•(3x-y)=

-2•(3,6x-5)+8•(2,5-4x) = -2•3,6x-2•(-5)+8•2,5+8•(-4x) = -7,2x+10+20-32x = 30-39,2x.
4,2•(-5x-2y)-2,7•(3x-y) = 4,2•(-5x)+4,2•(-2y)-2,7•3x-2,7•(-y) = -21x-8,4y-8,1x+2,7y = -29,1x-5,4y.