Question: What is the solution?

Solve 1139 = 56*a + 523 for a.

Answer: 11

Question: What is the solution?

Solve -29*a + 1265 - 888 = 0 for a.

Answer: 13

Question: What is the solution?

Solve 0 = -68*o + 7*o - 17*o - 780 for o.

Answer: -10

Question: What is the solution?

Solve 4*u + 24 = 8*u for u.

Answer:
6