$$3 ( x + 6 ) + 2 ( x + 3 ) = 64$$
$x=8$
$$3x+18+2\left(x+3\right)=64$$
$$3x+18+2x+6=64$$
$$5x+18+6=64$$
$$5x+24=64$$
$$5x=64-24$$
$$5x=40$$
$$x=\frac{40}{5}$$
$$x=8$$
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