Q: Solve -1487 - 783 = 201*t + 26*t for t.

A: -10

Q: Solve 0 = -935*r + 929*r + 6 for r.

A: 1

Q: Solve -507*z + 13299 = 68*z - 429 + 2228 for z.

A: 20

Q: Solve 428 = 10*c + 378 for c.

A:
5