Question:
Solve -7 - 21 = -7*m for m..

Answer:
4

Question:
Solve 475*z - 608*z = 939*z + 28647 + 11017 for z..

Answer:
-37

Question:
Solve 99*h = 1323 - 2511 for h..

Answer:
-12

Question:
Solve 0 = 41*v + 54 + 28 for v..

Answer:
-2