\"\"

\

The expression is \"\".

\

The value are \"\", \"\"\"\" and \"\".

\

\"\"     (Substitute \"\", \"\" and \"\")

\

                         \"\"                       (Multiply)

\

                         \"\"                            (Add: \"\")

\

                         \"\"                                  (Multiply)

\

                         \"\"                                        (Subtract: \"\")

\

Therefore, the value of expression is \"\".

\

\"\"

\

\"\".