Question:
Solve -21*k - 78 = -8*k for k..

Answer:
-6

Question:
Solve -56773*t = -56895*t + 4026 for t..

Answer:
33

Question:
Solve 31492 = -1859*t + 1748 for t..

Answer:
-16

Question:
Solve 637*u - 345*u - 361*u = -276 for u..

Answer:
4