$$0.3 ( 6 x - x ) = 5.4 ( 3 x + 8 )$$
$x = -\frac{144}{49} = -2\frac{46}{49} \approx -2.93877551$
$$0.3\times 5x=5.4\left(3x+8\right)$$
$$1.5x=5.4\left(3x+8\right)$$
$$1.5x=16.2x+43.2$$
$$1.5x-16.2x=43.2$$
$$-14.7x=43.2$$
$$x=\frac{43.2}{-14.7}$$
$$x=\frac{432}{-147}$$
$$x=-\frac{144}{49}$$
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