Q: Solve 0 = 42*k - 173 + 173 for k.

A: 0

Q: Solve 3*r - 3 = 6*r for r.

A: -1

Q: Solve -2033*c + 2036*c + 18 = 0 for c.

A: -6

Q: Solve 31723*a - 32699*a + 36112 = 0 for a.

A:
37