$\frac{3y-z}{3x+z};\:x=4;\:y=8;z=-3$
$9.3c-\left(4z-8.7\right)$
$-\sqrt{3}secx=2$
$\frac{d}{dx}e^{2x+7}e^{6-2x}$
$-5\::\:-5$
$\frac{-5-\sqrt{5^2-4\left(1\right)\left(-6\right)}}{2\left(1\right)}$
$15x^4-11x^2$
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