Posted by Celest on Thursday, July 11, 2013 at 4:56pm.
As I explained earlier, you need to get the unknowns on one side and the knowns on the other side.
c-5/4=3
Add 5/4 to both sides of the equation.
c -5/4 + 5/4 = 3 + 5/4
c = 3 5/4 = 4 1/4
Let's check it by substituting 4 1/4 for c.
4 1/4 - 1 1/4 = 3
Right!