$x^3y+x^2y^2-xy^3$
$722+135$
$9a^2+72ab+144b^2$
$1,3\cdot1,3$
$-\left(3-8\right)-\left(9-\left(-4+7\right)+2\right)$
$8x+5=36x^2$
$x^2-1\left(y'\right)_{-xy}$
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