Question: What is the solution?

Solve 2789*z + 12978 = -3659 - 8464 for z.

Answer: -9

Question: What is the solution?

Solve 1690*k - 1691*k = 0 for k.

Answer: 0

Question: What is the solution?

Solve 4991*j = 4846*j - 790 + 3690 for j.

Answer: 20

Question: What is the solution?

Solve -23*o = -21*o + 4 for o.

Answer:
-2