Question: What is the solution?

Solve 8 = -13*d + 21 for d.

Answer: 1

Question: What is the solution?

Solve -699*q = -2452*q - 92909 for q.

Answer: -53

Question: What is the solution?

Solve 0 = -25*w - 9*w + 543 + 545 for w.

Answer: 32

Question: What is the solution?

Solve -6*a - 27 + 9 = 0 for a.

Answer:
-3