Q: Solve -2475*r + 2485*r + 10 = 0 for r.

A: -1

Q: Solve -13860*b - 3852852 = -11943*b + 29407*b for b.

A: -123

Q: Solve -217 = 60*x - 1014 - 463 for x.

A: 21

Q: Solve -23714*a - 1775 = -23873*a + 1441 + 3939 for a.

A:
45