Question:
Solve -15*f = -2*f - f for f..

Answer:
0

Question:
Solve 37*n - 728 = 56*n + 33*n for n..

Answer:
-14

Question:
Solve 23081*y - 3026*y + 3008250 = 0 for y..

Answer:
-150

Question:
Solve 33*r + 122 + 161 + 212 = 0 for r..

Answer:
-15