$$3 ( 2 x - 1 ) - 5 ( x - 3 ) + 6 x = 81$$
$x = \frac{69}{7} = 9\frac{6}{7} \approx 9.857142857$
$$6x-3-5\left(x-3\right)+6x=81$$
$$6x-3-5x+15+6x=81$$
$$x-3+15+6x=81$$
$$x+12+6x=81$$
$$7x+12=81$$
$$7x=81-12$$
$$7x=69$$
$$x=\frac{69}{7}$$
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