Question:
Solve 358 = -186*u - 386 for u..

Answer:
-4

Question:
Solve 279048 = 5301*k + 1041*k for k..

Answer:
44

Question:
Solve -19*m = 3*m + 22 for m..

Answer:
-1

Question:
Solve 86*k + 250 = 164 for k..

Answer:
-1