$$\frac { 2 x + 1 } { x + 1 } = 3$$
$x=-2$
$$2x+1=3\left(x+1\right)$$
$$2x+1=3x+3$$
$$2x+1-3x=3$$
$$-x+1=3$$
$$-x=3-1$$
$$-x=2$$
$$x=-2$$
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