Question

-7+3n=-7-3n solution

Answer 1

n = 0
-7 + 3n = -7 - 3n
-7 + 6n = -7
6n = 0
n = 0

Answer 2

I believe it would be 0 because +3n and -3n cancel each other out leaving -7=-7. To get all numbers on one side, you have to add 7 to both sides, leaving you 0.