Write down the solution for this math problem: Solve -76*r + 54*r - 198 = 0 for r.
answer: -9

Write down the solution for this math problem: Solve -70 = -19*j - 222 for j.
answer: -8

Write down the solution for this math problem: Solve 3887 = -509*f - 30082 - 8787 for f.
answer: -84

Write down the solution for this math problem: Solve -231*y + 7808 - 777 = -1054*y - 9429 for y.
answer:
-20