Question

-(-8m)-(-7m+2)

Answer 1

lets tackle -(-7m+2) first.
it is nothing but
(-1)(-7m+2) = ??

Answer 2

negative and negative make a positive. negative and positive make negative.
so (-1)(-7m+2) = 7m-2

Answer 3

-(-8m) = 8m
so your equation becomes 8m + 7m -2

Answer 4

once you add the like terms you will have your answer

Answer 5

thanks