Answer
(Refer to the step by step part for the explanation).
$\\\\m=\dfrac{-20}{9}$
Work Step by Step
The error is in the denominator. It should have been$7-(-2)$.
$\\\\$Thus, the correct calculation is:
$\\\\m=\dfrac{-14-6}{7-(-2)}
\\\\m=\dfrac{-20}{9}$
