Answer
$$\frac{2m}{m-4}$$
Work Step by Step
multiply both numerator and denominator by (-1)
$\frac{(-1)m}{-1(4-m)}+\frac{3m}{m-4}$
$\frac{(-1)m}{m-4}+\frac{3m}{m-4}$
$\frac{(3-1)m}{m-4}$
$$\frac{2m}{m-4}$$
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