Question:
Solve 0 = -83*x + 1633 + 442 for x..

Answer:
25

Question:
Solve 0 = 23*f + 53 - 122 for f..

Answer:
3

Question:
Solve 9849 = 599*j - 3928 for j..

Answer:
23

Question:
Solve -u = 4*u + 4*u for u..

Answer:
0