Question: What is the solution?

Solve 0 = -8*f - 0 - 16 for f.

Answer: -2

Question: What is the solution?

Solve 1231*k = 2469*k - 1236*k - 24 for k.

Answer: 12

Question: What is the solution?

Solve -9*r + 18*r - 238 = 26*r for r.

Answer: -14

Question: What is the solution?

Solve 27*x - 403 + 105 = 80 for x.

Answer:
14