Write down the solution for this math problem: Solve -3161*f - 245*f = 1123*f - 516306 for f.
answer: 114

Write down the solution for this math problem: Solve 10*r + 9 = r for r.
answer: -1

Write down the solution for this math problem: Solve -3553*d + 275042 = -51834 for d.
answer: 92

Write down the solution for this math problem: Solve -15*n - n = 112 for n.
answer:
-7