Question: What is the solution?

Solve -2715*c - 236*c = 6069 + 14734 + 5756 for c.

Answer: -9

Question: What is the solution?

Solve 6*a = -8*a + 70 for a.

Answer: 5

Question: What is the solution?

Solve -9*f = -2*f - 21 for f.

Answer: 3

Question: What is the solution?

Solve -9*f + 7*f = 0 for f.

Answer:
0