What is the best way to simplify -LSB- math -RSB- \ frac -LCB- x - \ frac -LCB- 1 -RCB- -LCB- x -RCB- -RCB- -LCB- 1 + \ frac -LCB- 1 -RCB- -LCB- x -RCB- -RCB- -LSB- / math -RSB- where defined ?
List of social signal checkers ?