Question:
Solve -42*g = -20*g for g..

Answer:
0

Question:
Solve 4*d = d - 15 for d..

Answer:
-5

Question:
Solve -3*y + 211 = 235 for y..

Answer:
-8

Question:
Solve -4*l = 1 - 9 for l..

Answer:
2