Question:
Solve 10*s + 478 = 438 for s..

Answer:
-4

Question:
Solve v + 18 = -5*v for v..

Answer:
-3

Question:
Solve 30*x - 10068 + 9648 = 0 for x..

Answer:
14

Question:
Solve 11*v - 210 = 10*v - 20*v for v..

Answer:
10