1) (x+6y)-(8x-7y)=x+6y-8x-7y=9х+13у
2) (m+3)-(6m+5)-(m-1)=m+3-6m-5-m+1=-6m-1
3) (0.2x-3)-(x-2)-(0.4x-1)=0.2x-3-x+2-0.4x+1=-1,2х
1) (x+6y)-(8x-7y)=x+6y-8x-7y=9х+13у
2) (m+3)-(6m+5)-(m-1)=m+3-6m-5-m+1=-6m-1
3) (0.2x-3)-(x-2)-(0.4x-1)=0.2x-3-x+2-0.4x+1=-1,2х