Q: What is the solution?
Solve -156*z = -155*z - 2 for z.

A: 2

Q: What is the solution?
Solve -4*d + 8 = -15 + 19 for d.

A: 1

Q: What is the solution?
Solve 31*l + 301 = 45*l + 29*l for l.

A:
7