Fractions

Question

Answer 1

Step 1:

The expression is

Take out the common terms and simplify.

Step 2:

Simplified expression is

Add and subtract numerator is in the above step 2 expression.

Step 3:

Comments

Why add and subtract 3/8? Why 3/8 in particular? Why not add and subtract 1 for example?

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In this question Step 2: to Step 3: is shown

So, should be add and subtract  not 1.