$\left(-15\right)+20\left(-3\right)-10$
$\left(2x-7\right)\left(x-2\right)$
$2x^ay^3\:\:+\:3x^5y^7\:-\:x^by^8$
$xy'\:+\:\frac{y}{lnx}=9x^3$
$30x^2y-20x^3-40y^2$
$4\cdot\left(x+3\right)\ge-3\cdot\left(x-5\right)-1$
$\lim_{x\to-7}\left(\frac{\sqrt{7x^2-294}-7}{x+7}\right)$
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