Question: What is the solution?

Solve -42 - 24 = 2*b - 54 for b.

Answer: -6

Question: What is the solution?

Solve -53 + 32 = 7*z for z.

Answer: -3

Question: What is the solution?

Solve -263*b - 331 - 360 = -165 for b.

Answer: -2

Question: What is the solution?

Solve 144*r - 464 = -r + 261 for r.

Answer:
5