Question:
Solve -20*u + 19*u - 1 = 0 for u..

Answer:
-1

Question:
Solve 0 = -497*c - 260*c + 16654 for c..

Answer:
22

Question:
Solve 178*y - 312 - 2 = 42 for y..

Answer:
2

Question:
Solve 3*f - 6*f + 9*f = 3*f for f..

Answer:
0