Question:
Solve -21*c - 20 = 44*c - 540 for c..

Answer:
8

Question:
Solve 13093*y = 12888*y + 3280 for y..

Answer:
16

Question:
Solve -18*d = 131*d for d..

Answer:
0

Question:
Solve 0 = 4497931*c - 4498273*c + 29754 for c..

Answer:
87