Write down the solution for this math problem: Solve -7*n + 80 = 307 + 53 for n.
answer: -40

Write down the solution for this math problem: Solve 4445*n - 4226*n - 4599 = 0 for n.
answer: 21

Write down the solution for this math problem: Solve 5833 = 1909*v - 2216*v for v.
answer: -19

Write down the solution for this math problem: Solve 786*d - 2399 = 3103 for d.
answer:
7