$$9(2x-1)-3x=3(12+x)$$
$x = \frac{15}{4} = 3\frac{3}{4} = 3.75$
$$18x-9-3x=3\left(12+x\right)$$
$$15x-9=3\left(12+x\right)$$
$$15x-9=36+3x$$
$$15x-9-3x=36$$
$$12x-9=36$$
$$12x=36+9$$
$$12x=45$$
$$x=\frac{45}{12}$$
$$x=\frac{15}{4}$$
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