=76*1/23-76*1/53+23*1/53-53*1/23+53*1/76
=(76*1/23-53*1/23)-(76*1/53-23*1/53)+53*1/76
=23*1/23-53*1/53+53/76
=1-1+53/76
=53/76
=76*1/23-76*1/53+23*1/53-53*1/23+53*1/76
=(76*1/23-53*1/23)-(76*1/53-23*1/53)+53*1/76
=23*1/23-53*1/53+53/76
=1-1+53/76
=53/76