Question: What is the solution?

Solve 4*w = 10*w + 18 for w.

Answer: -3

Question: What is the solution?

Solve -5*w + 20*w - 91 = -16 for w.

Answer: 5

Question: What is the solution?

Solve 3106*s - 67300 = -581*s + 83867 for s.

Answer: 41

Question: What is the solution?

Solve 0 = 87*q + 44*q + 1310 for q.

Answer:
-10