$9a-3\left(a-5\right)$
$y'-\frac{y}{x}=xe^x$
$\lim_{x\to\infty}\left(\frac{x^2+2x-3}{x^2-5x+4}\right)$
$\sqrt[4]{x^2}y^2\cdot\sqrt[5]{x^2}y$
$-2\left(-21\right)\left(-5\right)$
$\frac{3x}{4}=24$
$-10+-7+-9$
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