$420-350+200+60$
$\frac{d^2}{dx^2}\left(y^2-x^2\right)$
$\left(y-\:x\right)^2$
$-\frac{1}{3}\sqrt{x}\left(-3\sqrt{x}-5xy-9\right)$
$\frac{2x^3+x}{x+3}$
$\left(10+xy^3\right)\left(10-xy^3\right)$
$24a-36b$
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