Write down the solution for this math problem: Solve 16*y - 399 = -31*y + 68*y for y.
answer: -19

Write down the solution for this math problem: Solve -2837*b - 239*b - 7223*b = 81488 - 678830 for b.
answer: 58

Write down the solution for this math problem: Solve 22*r = 1836 - 1902 for r.
answer: -3

Write down the solution for this math problem: Solve -41078 - 14834 - 17604 = 2052*i + 12668 for i.
answer:
-42