Question: What is the solution?

Solve -177*r + 149 = 857 for r.

Answer: -4

Question: What is the solution?

Solve -364 = -53*n - 470 for n.

Answer: -2

Question: What is the solution?

Solve -50*j + 192*j = -6434 - 1660 for j.

Answer: -57

Question: What is the solution?

Solve -238*f = 162*f - 94*f + 503 - 5399 for f.

Answer:
16