Write down the solution for this math problem: Solve 437*f - 421*f - 64 = 0 for f.
answer: 4

Write down the solution for this math problem: Solve -628990*u = -628845*u + 49 + 96 for u.
answer: -1

Write down the solution for this math problem: Solve -33*g = -43*g + 30 for g.
answer: 3

Write down the solution for this math problem: Solve j + 3*j = -4 for j.
answer:
-1