Question: What is the solution?

Solve -3*u = 503 - 491 for u.

Answer: -4

Question: What is the solution?

Solve 109 = 21*n - 38 for n.

Answer: 7

Question: What is the solution?

Solve 58*s - 750580 = -751740 for s.

Answer: -20

Question: What is the solution?

Solve 78*t + 86*t + 300 = 194*t for t.

Answer:
10