Question: What is the solution?

Solve -15*a + 9*a - 49 = a for a.

Answer: -7


Question: What is the solution?

Solve 138*z + 270 = 1819 - 4102 - 3381 for z.

Answer: -43


Question: What is the solution?

Solve -21646*l + 16692 = -21967*l for l.

Answer: -52


Question: What is the solution?

Solve -4*k + 36 = -10*k for k.

Answer:
-6