Question: What is the solution?

Solve -39*i = -38*i - 4 for i.

Answer: 4

Question: What is the solution?

Solve -3697957*k - 392 = -3697950*k for k.

Answer: -56

Question: What is the solution?

Solve 4*v + 36 = 8 - 12 for v.

Answer: -10

Question: What is the solution?

Solve 3596 - 15967 = 378*r + 859 for r.

Answer:
-35