Question:
Solve -30*u = -5*u - 125 for u..

Answer:
5

Question:
Solve 62*j - 57 + 429 = 0 for j..

Answer:
-6

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

Answer:
-4

Question:
Solve -20157*h + 20180*h + 46 = 0 for h..

Answer:
-2