Write down the solution for this math problem: Solve 0 = 154*r - 148*r - 18 for r.
answer: 3

Write down the solution for this math problem: Solve 0 = 1939*i - 1958*i - 228 for i.
answer: -12

Write down the solution for this math problem: Solve 858*r + 16 - 139 = 899*r for r.
answer: -3

Write down the solution for this math problem: Solve -97*m + 2853 = 220*m for m.
answer:
9