Question: What is the solution?

Solve 3 + 1 = 4*p for p.

Answer: 1

Question: What is the solution?

Solve 1221*u + 784 = 37910 + 725 for u.

Answer: 31

Question: What is the solution?

Solve 40*r - 1081*r - 7490 = 14371 for r.

Answer: -21

Question: What is the solution?

Solve -6*k + 23*k - 6*k = -88 for k.

Answer:
-8