Question: What is the solution?

Solve 9*v + 20 = 14*v for v.

Answer: 4

Question: What is the solution?

Solve -2061 = -19*u - 1776 for u.

Answer: 15

Question: What is the solution?

Solve 0 = -5*i + 21 + 4 for i.

Answer: 5

Question: What is the solution?

Solve 30 + 57 = 17*w - 83 for w.

Answer:
10