Question: What is the solution?

Solve -285 = 48*r - 72 + 75 for r.

Answer: -6

Question: What is the solution?

Solve 7*i = 29*i - 178 - 526 for i.

Answer: 32

Question: What is the solution?

Solve -744*j + 561 - 1738 = -637*j for j.

Answer: -11

Question: What is the solution?

Solve 0 = 66*f + 38 + 103 + 255 for f.

Answer:
-6