Step 1: Substitute for x, re-writing the problem as:
5 - (3/15) =

Step 2: Find the lowest common denominator and find equivalent
fractions.
(5/1) - (3/15)=
(75/15) - (3/15)

Step 3: Once you have a common denominator, add or subtract the
numerators.
(75/15) - (3/15)=
(75-3)/15 =
72 / 15

Step 4: Express as a proper fraction. and reduce. How many
times does 15 divide into 72 evenly, and what is the remainder?
72 / 15 =
4 + (12/15)=
4 + (4/5)

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