$x^2-15x+13$
$-4.6-5$
$3m^2n;m\:=\:2yn\:=\:-3$
$-15-\left(-25\right)$
$\left(p+7\right)\left(a-7\right)$
$\lim_{x\to0}\left(\frac{\left(8^x-7^x\right)}{3^x-2^x}\right)$
$\sqrt{x^2}+x+1=x-1$
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