Question:
Solve -5*u = -10*u for u..

Answer:
0

Question:
Solve 2375 = -5814*k + 5719*k for k..

Answer:
-25

Question:
Solve 4*q + 6086 = 6122 for q..

Answer:
9

Question:
Solve -125 = -17*b - 40 for b..

Answer:
5