Q: Solve:
Solve -1781 + 1804 = 23*z for z.

A: 1

Q: Solve:
Solve -281 - 851 + 304 = -69*f for f.

A: 12

Q: Solve:
Solve 215*i - 18000 = 855*i + 625 + 3135 for i.

A:
-34