Question:
Solve -13*w = 10 + 3 for w..

Answer:
-1

Question:
Solve -144*n - 2434 + 40 = -30*n for n..

Answer:
-21

Question:
Solve 0 = 60*f - 146 - 154 for f..

Answer:
5

Question:
Solve 12 + 174 = -108*n - 30 for n..

Answer:
-2