Write down the solution for this math problem: Solve 22*u - 3831 + 3721 = 0 for u.
answer: 5

Write down the solution for this math problem: Solve n + 0 + 5 = 0 for n.
answer: -5

Write down the solution for this math problem: Solve 1380 = 123*b - 110*b + 47*b for b.
answer: 23

Write down the solution for this math problem: Solve -110 = 40*v + 250 for v.
answer:
-9