Q: What is the solution?
Solve 7*u - 5 = 12*u for u.

A: -1

Q: What is the solution?
Solve -12742*z + 12775*z = 99 for z.

A: 3

Q: What is the solution?
Solve 820*t - 1615*t + 815*t + 420 = 0 for t.

A:
-21