Write the 's as so everything
will be fractions:
Put parentheses around the top and bottom:
The LCD of all four denominators is .
Put it over 1 and put parentheses around it,
Then multiply top and bottom by that:
Now use the distributive principle to remove the
parentheses on the right:
Cancel the 's in the top left and the bottom right
terms and erase the 's and we get
Remove the parentheses and we get:
Combining terms on top and bottom, we end up with
Edwin