$$\left. \begin{array} { l } { - 2 } \\ { \frac { x ^ { 3 } - 4 - x + 4 x ^ { 2 } } { x ^ { 2 } + 3 x - 4 } } \end{array} \right.$$
$2\left(x+1\right)$
$$-2=-2$$
$$2\left(x+1\right)$$
$$2x+2$$
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$-2,\ x+1$
