You have the equation [tex] \frac{c-2}{13} = 1[/tex]. To solve for the variable c, you need to get c on one side by itself to equal something. So the final answer should be
c = (some number).
The first step is to multiply both sides by 13. This will cancel the 13 in the denominator of the left side because 13/13 = 1.
[tex]13*\frac{c-2}{13} = 1*13 \\
c - 2 = 13[/tex]
Almost there... now we have to move the -2 to the other side. We can do this by adding 2 to both sides of the equation.
[tex]c - 2 +2 = 13 + 2 \\
c = 15[/tex]
