Write down the solution for this math problem: Solve 0 = 8*r + 21 + 19 for r.
answer: -5

Write down the solution for this math problem: Solve 699 + 966 = -155*c + 580 for c.
answer: -7

Write down the solution for this math problem: Solve 8*m - 5*m = -6 for m.
answer: -2

Write down the solution for this math problem: Solve -5*c + 6*c - 71015 = -71031 for c.
answer:
-16