Question:
Solve -1868559*r - 105 = -1868524*r for r..

Answer:
-3

Question:
Solve -21*h - 948*h - 3955 = -28180 for h..

Answer:
25

Question:
Solve 2*m + 0 = 12 for m..

Answer:
6

Question:
Solve 22178*d + 3289 = 21879*d for d..

Answer:
-11