Question: What is the solution?

Solve -5*l = -l + 8 for l.

Answer: -2

Question: What is the solution?

Solve 1398*a + 1647*a + 8308 = 4186*a - 1409*a for a.

Answer: -31

Question: What is the solution?

Solve 18*r + 14 = 20*r for r.

Answer: 7

Question: What is the solution?

Solve 423*z - 16775 = -248*z for z.

Answer:
25