$$\frac{ 3 }{ 5 } = \frac{ 6.4-x }{ x }$$
$x=4$
$$3x=5\left(6.4-x\right)$$
$$3x=32-5x$$
$$3x+5x=32$$
$$8x=32$$
$$x=\frac{32}{8}$$
$$x=4$$
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