Question: What is the solution?

Solve 2579*z - 258895 - 36429 = 21893 for z.

Answer: 123

Question: What is the solution?

Solve 30233*d = 25871*d - 117774 for d.

Answer: -27

Question: What is the solution?

Solve 6 = 4*a - 2 for a.

Answer: 2

Question: What is the solution?

Solve 28 = 11*r - 26 - 56 for r.

Answer:
10