Q: What is the solution?
Solve 5*d + 70*d + 2765 = -223*d - 3791 for d.

A: -22

Q: What is the solution?
Solve -7*w + 20 = 3*w for w.

A: 2

Q: What is the solution?
Solve 33*r + 39 = 6 for r.

A:
-1