Question: What is the solution?

Solve -39*t - 858 = 23*t + 1498 for t.

Answer: -38

Question: What is the solution?

Solve 399*m + 343*m + 23884 + 42896 = 0 for m.

Answer: -90

Question: What is the solution?

Solve 17*u + 63*u = -90*u for u.

Answer: 0

Question: What is the solution?

Solve -63*d - 14 = -70*d for d.

Answer:
2