Question: What is the solution?

Solve 2*a - 4*a - 4 = 0 for a.

Answer: -2

Question: What is the solution?

Solve -2560*k + 1249*k + 1273*k - 1596 = 0 for k.

Answer: -42

Question: What is the solution?

Solve 27*y - 18 = 90 for y.

Answer: 4

Question: What is the solution?

Solve 3*i + i = -20*i for i.

Answer:
0