$$\left. \begin{array} { l } { .4 ( 5 x - 3 ) = 6.8 } \end{array} \right.$$
$x=4$
$$5x-3=\frac{6.8}{0.4}$$
$$5x-3=\frac{68}{4}$$
$$5x-3=17$$
$$5x=17+3$$
$$5x=20$$
$$x=\frac{20}{5}$$
$$x=4$$
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