$8y\le80$
$\sqrt{x+2}+\:\sqrt{x+7}=\:5$
$s-21\le-18$
$1+4x+5x^2-7x^3+20x^3+12x^2-10$
$2x^4+x^3-8x^2-x+6$
$\int sen^2\left(x\right)\cdot\cos^3\left(x\right)dx$
$\left(x^2y^3-8\right)\left(8+x^2y^3\right)$
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