Question

4 (7-5x)-(12-20x)
2 (3x-y)-(5x-2y)
6 (x+2y)-3 (2x+y)
5 (4x+y)-2(x-y)

Answer 1

28-20х-12+20х=28-12=61
6х-2y-5x+2y=x
6x+12y-6x-3y=9y
20x+5y-2x+2y=18х+7y

Answer 2

Там не 61 а 16