to solve, first distribute your negative on the left side.
-(q+7) -> -q-7
now, just balance out both sides by first adding your left q to your right q’s
-q-7 = -6+8
+q +q
-7 = -5q + 8
then, subtract your 8 from both sides
-7 = -5q + 8
-8 -8
-15 = -5q
finally, just solve for q by dividing both sides by -5
-15 = -5q
/-5 /-5
3 = q
