$\:\left(-15\right)\:-\:\left(-18\right)$
$\frac{4}{x}-3\le\frac{1}{x}-7$
$\cos\left(y\right)\left(\sec\left(y\right)-\cos\left(y\right)\right)$
$17x^5-51x^4-34x$
$-8p^2-2p^2$
$25x^2-12x-75$
$\sqrt{25y^6}$
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