Question: What is the solution?

Solve 1498 - 1444 = 41*r + 13*r for r.

Answer: 1

Question: What is the solution?

Solve -195*s + 487*s - 4440 = -152*s for s.

Answer: 10

Question: What is the solution?

Solve 68 = -15*w + 38 for w.

Answer: -2

Question: What is the solution?

Solve -39*l + 45*l + 6 = 0 for l.

Answer:
-1