$y^2+15y$
$a^5\:a^{-3}$
$-9a^2-12ab-b^2$
$20x+4+28x^2$
$\left(4\right)\:\left(5\right)\:\:+\:\left(2\right)\:\:\left(5\right)$
$x^2-14+144$
$\frac{32x^{15}}{8x^8}$
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