$9x^2-12x-5$
$xy=2x^2+10x+12$
$-9\:-\:\left(-\:12\:+\:1\right)$
$2+6:\left(-3\right)-24:\left(-6\right)+\left(-72\right):12$
$\frac{1}{v\:}.e^{x+2z}+-\frac{u}{v^2}.2xz$
$2x+64=4x+30$
$\lim_{x\to infinity}\left(\sqrt{x+6}-\sqrt{x+4}\right)$
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