Question: What is the solution?

Solve w = -5*w for w.

Answer: 0

Question: What is the solution?

Solve 11*u + 2 + 31 = 0 for u.

Answer: -3

Question: What is the solution?

Solve -9*d + 14*d = -25 for d.

Answer: -5

Question: What is the solution?

Solve 145 = 32*i - 310 - 217 for i.

Answer:
21