Question: What is the solution?

Solve -1408*b = -1401*b + 7 for b.

Answer: -1

Question: What is the solution?

Solve 23*y - 238*y + 1616 = 189*y for y.

Answer: 4

Question: What is the solution?

Solve -1064 + 1040 = 6*i for i.

Answer: -4

Question: What is the solution?

Solve 0 = -17*f - 30 - 4 for f.

Answer:
-2