Write down the solution for this math problem: Solve 64*s = 677 - 101 for s.
answer: 9

Write down the solution for this math problem: Solve 38*a - 51 = 21*a for a.
answer: 3

Write down the solution for this math problem: Solve -3*i + 486*i = 64*i + 8380 for i.
answer: 20

Write down the solution for this math problem: Solve 359*c + 2760*c + 671*c - 448*c = -270702 for c.
answer:
-81