Question: What is the solution?

Solve 128 = 2*d + 120 for d.

Answer: 4

Question: What is the solution?

Solve -41*w - 15 = -121 - 17 for w.

Answer: 3

Question: What is the solution?

Solve 1834 = -679936*a + 679842*a - 6208 + 522 for a.

Answer: -80

Question: What is the solution?

Solve 1117*z = 2238*z for z.

Answer:
0