Question: What is the solution?

Solve -22*w + 20*w = 0 for w.

Answer: 0

Question: What is the solution?

Solve -5*f + 23 + 123 = -0*f - 104 for f.

Answer: 50

Question: What is the solution?

Solve 0 = -6*w + 4 - 19 - 21 for w.

Answer: -6

Question: What is the solution?

Solve 147 - 143 = -u for u.

Answer:
-4