$$3 ( x + 2 ) - 2 ( x - 1 ) = 7$$
$x=-1$
$$3x+6-2\left(x-1\right)=7$$
$$3x+6-2x+2=7$$
$$x+6+2=7$$
$$x+8=7$$
$$x=7-8$$
$$x=-1$$
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