Question:
Solve 2*m - 28 = -5*m for m..

Answer:
4

Question:
Solve 78*k + 294 = 840 for k..

Answer:
7

Question:
Solve -236*y = -208*y - 289*y for y..

Answer:
0

Question:
Solve 159*h - 425 = 74*h for h..

Answer:
5