Question: What is the solution?

Solve -377*k = -51*k - 5868 for k.

Answer: 18

Question: What is the solution?

Solve -534*d + 494*d - 1120 = 0 for d.

Answer: -28

Question: What is the solution?

Solve -29*i + 144 + 137 = -67 for i.

Answer: 12

Question: What is the solution?

Solve 4*y = 12*y - 7*y - 75 - 15 for y.

Answer:
90