Evaluate the limit : `lim_(x->0) (18+7/x)`

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If `x` is a small positive number, then `7/x` and therefore `18+7/x` are both large positive numbers. However, if `x` is a small negative number, then `7/x` and therefore `18+7/x` are both large *negative *numbers. Expressed mathematically,

`lim_(x->0^+) (18+7/x)=oo,` but

`lim_(x->0^-)(18+7/x)=-oo.`

Therefore **the limit does not exist.**

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