$-13-\left(-45\right)-20+-8$
$9xy^2-7x^2y+x+5x^2$
$\frac{7x-2x^3-5}{x+2}$
$-\left(-\left(-3\right)\right)$
$\left(-\:a\:-\:b\:+\:2x\:-\:y\right)\:\left(a\:+\:b\:+\:2x\:-\:y\right)\:$
$-4-\left|-18\right|$
$8y^2-14y-15$
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