Question 209783
x-2/2 = m + n

Multiply both sides by 2.

x - 2 = 2(m + n)

I assume we are solving for x (you did not say).

x - 2 = 2m + 2n

x = 2m + 2n + 2

Factor out 2 on the right side.

x = 2(m + n + 1)