What does 5c-3 equals 2c 6 equals?

If you meant you want to solve for c on: 5c-3 = 2c+6
you have to simplify the formula.
Step 1: Subtract 2c from both sides:
3c-3 = 6
Step 2: Add 3 to both sides
3c = 9
Step 3: Divide both sides by 3
c = 3