What is -LSB- math -RSB- x -LSB- / math -RSB- if -LSB- math -RSB- x + \ left -LRB- \ dfrac -LCB- 1 -RCB- -LCB- x -RCB- \ right -RRB- = 0 -LSB- / math -RSB- ?
What is -LSB- math -RSB- \ mathop -LCB- \ lim -RCB- \ limits _ -LCB- x \ to 0 ^ + -RCB- \ frac -LCB- 1 -RCB- -LCB- x -RCB- ^ \ frac -LCB- - x -RCB- -LCB- x +1 -RCB- -LSB- / math -RSB- ?