$$\frac { 2 } { 5 } ( x + 10 ) = 2 x + 3$$
$x=\frac{5}{8}=0.625$
$$\frac{2}{5}x+\frac{2}{5}\times 10=2x+3$$
$$\frac{2}{5}x+\frac{2\times 10}{5}=2x+3$$
$$\frac{2}{5}x+\frac{20}{5}=2x+3$$
$$\frac{2}{5}x+4=2x+3$$
$$\frac{2}{5}x+4-2x=3$$
$$-\frac{8}{5}x+4=3$$
$$-\frac{8}{5}x=3-4$$
$$-\frac{8}{5}x=-1$$
$$x=-\left(-\frac{5}{8}\right)$$
$$x=\frac{5}{8}$$
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