Question:
Solve 21*t + 9 = 10*t - 2 for t..

Answer:
-1

Question:
Solve 4832*c + 10440 = 5528*c for c..

Answer:
15

Question:
Solve 13*m = 9*m - 12 for m..

Answer:
-3

Question:
Solve -9926*y + 9935*y + 18 = 0 for y..

Answer:
-2