$$\left. \begin{array} { l } { \frac { x } { 10 } + \frac { x } { 2 } + \frac { 2 x } { 4 } = 5 x + 2 } \end{array} \right.$$
$x=-\frac{20}{39}\approx -0.512820513$
$$2x+10x+5\times 2x=100x+40$$
$$12x+5\times 2x=100x+40$$
$$12x+10x=100x+40$$
$$22x=100x+40$$
$$22x-100x=40$$
$$-78x=40$$
$$x=\frac{40}{-78}$$
$$x=-\frac{20}{39}$$
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