Answer
$-1$
Work Step by Step
$a > b\Rightarrow \left| b-a\right| =-\left( b-a\right) \Rightarrow \lim _{v\rightarrow 4^+}\dfrac {4-v}{\left| 4-v\right| }=\dfrac {4-v}{-\left( 4-v\right) }=-1$
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