$$2(x+5)-3(x-6)=40$$
$x=-12$
$$2x+10-3\left(x-6\right)=40$$
$$2x+10-3x+18=40$$
$$-x+10+18=40$$
$$-x+28=40$$
$$-x=40-28$$
$$-x=12$$
$$x=-12$$
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