Question: What is the solution?

Solve 20 = -27*u - 88 for u.

Answer: -4

Question: What is the solution?

Solve -917*f + 309*f - 210 = -305*f - 318*f for f.

Answer: 14

Question: What is the solution?

Solve 9*k + 4 = 4 for k.

Answer: 0

Question: What is the solution?

Solve 268*u + 797 = -40*u - 435 for u.

Answer:
-4