Question: What is the solution?

Solve 7*j = 5*j - 10*j for j.

Answer: 0

Question: What is the solution?

Solve 0 = 106*f - 159 + 265 for f.

Answer: -1

Question: What is the solution?

Solve 206*b - 8290 = -8702 for b.

Answer: -2

Question: What is the solution?

Solve 0 = -135*l + 107*l + 252 for l.

Answer:
9