Question: What is the solution?

Solve -81*x + 55*x + 156 = 0 for x.

Answer: 6

Question: What is the solution?

Solve 0 = -9*f + 6 - 42 for f.

Answer: -4

Question: What is the solution?

Solve 59*k = 832 + 348 for k.

Answer: 20

Question: What is the solution?

Solve 732540 - 51231 = 4771*i + 4562*i for i.

Answer:
73