Question

-1,6a+7,2a
13x-18y-20x+4y
72m-81m+5m-a

Answer 1

-1,6a+7,2a=5.6а
13x-18y-20x+4y=-7x-14y=-7(x+2y)
72m-81m+5m-a=-4m-a
Так?

Answer 2

спасибо большое