$$( \frac{ 13 }{ 7 } { x }^{ 3a+2 } - \frac{ 15 }{ 6 } { y }^{ 2a-5 } )$$
$\frac{26x^{3a+2}-35y^{2a-5}}{14}$
$$\frac{26x^{3a+2}-35y^{2a-5}}{14}$$
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$\frac{13x^{3a+2}}{7}-\frac{5y^{2a-5}}{2}$
