$14-\left(-4\right)$
$\frac{\left(x+7\right)\left(x+3\right)-x^2-21}{2x}$
$p\left(30\right)=5x^{3m-6}$
$\frac{\left(e^{e^{15}-2}+3\right)}{5}=x$
$\lim_{x\to\frac{x}{2}}\:9\cos\left(-7x\right)\sec\left(9x\right)$
$18n-7-2n$
$3\left(x+5\right)-5$
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