$$10x-(2x+9)=-3(15-4x)$$
$x=9$
$$10x-2x-9=-3\left(15-4x\right)$$
$$8x-9=-3\left(15-4x\right)$$
$$8x-9=-45+12x$$
$$8x-9-12x=-45$$
$$-4x-9=-45$$
$$-4x=-45+9$$
$$-4x=-36$$
$$x=\frac{-36}{-4}$$
$$x=9$$
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