Question: What is the solution?

Solve 40*d - 41 = -66 - 55 for d.

Answer: -2

Question: What is the solution?

Solve 0 = 411*c + 385*c - 944*c - 3256 for c.

Answer: -22

Question: What is the solution?

Solve -6*w - 7 = 11 for w.

Answer: -3

Question: What is the solution?

Solve -25*n + 39*n - 105 = 14*n + 15*n for n.

Answer:
-7