(3х+y)-(-x-4y) (x+6y)-(8x-7y) (m+n)-(m-n) (m+3)-(6m+5)-(m-1) (x-y)+(x-y)-(2x+y)

Question

(3х+y)-(-x-4y)
(x+6y)-(8x-7y)
(m+n)-(m-n)
(m+3)-(6m+5)-(m-1)
(x-y)+(x-y)-(2x+y)

Answer 1

(3х+y)-(-x-4y)=4х+5у
(x+6y)-(8x-7y)=-7х+13у
(m+n)-(m-n)=2n
(m+3)-(6m+5)-(m-1)=-1-6m
(x-y)+(x-y)-(2x+y)=-3y