Write down the solution for this math problem: Solve 151*r = -123*r + 301*r - 427 - 1328 for r.
answer: 65

Write down the solution for this math problem: Solve -6439*q = -6507*q + 1768 for q.
answer: 26

Write down the solution for this math problem: Solve -336 = 3*b - 330 for b.
answer: -2

Write down the solution for this math problem: Solve 16*a = -3*a - 76 for a.
answer:
-4