$15x\:\:\:\:=-30$
$\lim_{x\to4}\left(\frac{\sqrt{5x}-\sqrt{6x-4}}{x-4}\right)$
$5b-2+4b+5$
$-\:587\:-\:221\:+\:179\:-\:981\:-\:321\:+\:956\:+\:291\:-\:184\:-\:317\:+\:729\:+\:120\:-\:381\:$
$nvauyv$
$\frac{x^2+x}{1-2x}$
$\lim_{x\to\infty}\left(\frac{x^2+3x}{x^2-2}\right)^x$
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