$-3x-5x-10x-12x$
$\int7tan^4x\:sec^4\:x\:dx$
$\left(c-8\right)\left(c-6\right)=0$
$3c\:-\:c\:-\:12c\:+\:20c$
$\lim_{x\to\infty}\frac{1}{x^2-x-1}$
$2-3\cdot\left(2-1\right)$
$\:x^2-10x=75$
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