Question: What is the solution?

Solve 160*k = 49 - 1169 for k.

Answer: -7

Question: What is the solution?

Solve 1148 - 4686 = -343*y - 1881 + 12063 for y.

Answer: 40

Question: What is the solution?

Solve 673*a - 12972 = 900*a + 8685*a - 137740 for a.

Answer: 14

Question: What is the solution?

Solve 30*r - 29*r - 2 = 0 for r.

Answer:
2