Question: What is the solution?

Solve 34*r + 87*r - 1332 = 10*r for r.

Answer: 12

Question: What is the solution?

Solve -278775 = 3848*f + 35*f + 101759 for f.

Answer: -98

Question: What is the solution?

Solve 8*b + 106 = 90 for b.

Answer: -2

Question: What is the solution?

Solve -9585 = 699*k + 6979 - 5380 for k.

Answer:
-16