The expression is .

                                     ( can be written as )

                        (Substitute )

Mixed fraction can be written as improper fraction.

                         ()

Divide by a fraction, multiply by its multiplicative inverse.

So, , where .

                            (Product of two different signs is negative)

If , where b,d .

                                   (Multiply numerator: )

                                   (Multiply denominator: )

                                           (Divide: )

The simplest form is .