$$9(x+10)=3(x+6)$$
$x=-12$
$$9x+90=3\left(x+6\right)$$
$$9x+90=3x+18$$
$$9x+90-3x=18$$
$$6x+90=18$$
$$6x=18-90$$
$$6x=-72$$
$$x=\frac{-72}{6}$$
$$x=-12$$
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