$$3 x ( x + 3 ) - 2 x ( 2 x + 1 ) + 8 x ( x - 1 )$$
$x\left(7x-1\right)$
$$3x^{2}+9x-2x\left(2x+1\right)+8x\left(x-1\right)$$
$$3x^{2}+9x-2x\left(2x+1\right)+8x^{2}-8x$$
$$3x^{2}+9x-4x^{2}-2x+8x^{2}-8x$$
$$-x^{2}+9x-2x+8x^{2}-8x$$
$$-x^{2}+7x+8x^{2}-8x$$
$$7x^{2}+7x-8x$$
$$7x^{2}-x$$
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$7x^{2}-x$
