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
Therefore the limit does not exist.
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