Question: What is the solution?

Solve 124*d = 76*d - 384 for d.

Answer: -8

Question: What is the solution?

Solve -31*z + 72 = -55*z for z.

Answer: -3

Question: What is the solution?

Solve 14*q - 39 = -95 for q.

Answer: -4

Question: What is the solution?

Solve 14*u + 42 = 70 for u.

Answer:
2