Q: Solve 1006*t - 31470 = -43*t for t.

A: 30

Q: Solve 0 = -8*d + 4*d - 4 for d.

A: -1

Q: Solve -163*u - 7*u - 519 = 3*u for u.

A: -3

Q: Solve 4561 + 3503 + 7380 = 420*r - 24*r for r.

A:
39