Q: Solve:
Solve 47*a - 42*a - 15 = 0 for a.

A: 3

Q: Solve:
Solve 140*k - 290*k + 48 = -142*k for k.

A: 6

Q: Solve:
Solve 0 = -39*t + 8*t + 93 for t.

A:
3