Question: What is the solution?

Solve 40*c - 28 = 47*c for c.

Answer: -4

Question: What is the solution?

Solve -69 + 63 = -6*z for z.

Answer: 1

Question: What is the solution?

Solve -11*d + 3*d = -8 for d.

Answer: 1

Question: What is the solution?

Solve 76714 = 2231*n + 31557 - 99858 for n.

Answer:
65