Question: What is the solution?

Solve -189*r + 515*r = 2320 + 1918 for r.

Answer: 13

Question: What is the solution?

Solve -16094*a - 319 = -16065*a for a.

Answer: -11

Question: What is the solution?

Solve -593*s - 8266 = 22*s - 4188 + 10067 for s.

Answer: -23

Question: What is the solution?

Solve 19*t = 5*t - 98 for t.

Answer:
-7