Question: What is the solution?

Solve 13*x + 77*x - 15 - 75 = 0 for x.

Answer: 1

Question: What is the solution?

Solve 3041*m = -549*m + 114229 + 76041 for m.

Answer: 53

Question: What is the solution?

Solve 411*z = 405*z for z.

Answer: 0

Question: What is the solution?

Solve 1455*f = 1353*f + 1326 for f.

Answer:
13