Q: Solve:
Solve -756 = 1370*k + 34226 + 14338 for k.

A: -36

Q: Solve:
Solve 98*a + 129*a - 11*a = 864 for a.

A: 4

Q: Solve:
Solve 0 = -57*r + 3224 - 2369 for r.

A:
15