Write down the solution for this math problem: Solve 0 = -31*n + 291 - 136 for n.
answer: 5

Write down the solution for this math problem: Solve -1568 = 42*h - 399 - 539 for h.
answer: -15

Write down the solution for this math problem: Solve 173*d - 310*d - 209*d + 11977 = 67*d for d.
answer: 29

Write down the solution for this math problem: Solve -154*d - 44*d = 50*d + 3224 for d.
answer:
-13