Question: What is the solution?

Solve 858*r + 6576 = 735*r + 918 for r.

Answer: -46

Question: What is the solution?

Solve -o - o = 6 for o.

Answer: -3

Question: What is the solution?

Solve 1169*j + 10608 - 47123 = 4117*j + 258285 for j.

Answer: -100

Question: What is the solution?

Solve -40*z - 33*z + 4*z - 1104 = 0 for z.

Answer:
-16