Question: What is the solution?

Solve 289*y + 5283 = -220*y + 64*y - 947 for y.

Answer: -14

Question: What is the solution?

Solve -13*k + 91*k = 496*k - 11704 for k.

Answer: 28

Question: What is the solution?

Solve 871*z - 878*z + 35 = 0 for z.

Answer: 5

Question: What is the solution?

Solve 1202*r - 5143 = -1290*r + 2631*r for r.

Answer:
-37