Question 795697
-6 + 5n = 5n + 6n
-6 + 5n - 5n = 5n - 5n + 6n
-6 = 6n
-6/6 = 6n/6
-1 = n

check:
-6 + 5(-1) = 5(-1) + 6(-1)
-6 - 5 = -5 - 6
-11 = -11