$$4x- \frac{ 2 }{ 5 } x-(3x-y)+ \{ \frac{ 1 }{ 2 } x- \frac{ 1 }{ 5 } y-[ \frac{ 1 }{ 6 } x- \frac{ 1 }{ 3 } y]$$
$\frac{14x+17y}{15}$
$$\frac{20x-2x-5\left(3x-y\right)+5\frac{x}{2}-\frac{y}{5}-\left(\frac{x}{6}-\frac{y}{3}\right)}{5}$$
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