Question: What is the solution?

Solve 2*m = 4*m + 10 for m.

Answer: -5

Question: What is the solution?

Solve -69 - 43 = -28*y for y.

Answer: 4

Question: What is the solution?

Solve 0 = 81*u + 45 + 728 + 442 for u.

Answer: -15

Question: What is the solution?

Solve 142 = 71*w - 426 for w.

Answer:
8