Write down the solution for this math problem: Solve 58*i = 85*i + 486 for i.
answer: -18

Write down the solution for this math problem: Solve -4*c = 2 - 10 for c.
answer: 2

Write down the solution for this math problem: Solve 74*s - 501 - 683 = 4*s - 4*s for s.
answer: 16

Write down the solution for this math problem: Solve -211*a = 1383903 - 1361959 for a.
answer:
-104