Question: What is the solution?

Solve 40*t + 22 + 8 = -10 for t.

Answer: -1

Question: What is the solution?

Solve -9 = -9*l - 27 for l.

Answer: -2

Question: What is the solution?

Solve -69*l + 426 = -954 for l.

Answer: 20

Question: What is the solution?

Solve 0 = 21*a - 31*a - 10 for a.

Answer:
-1