$\left(3mn^2+7x^2m\right)\left(3mn^2-7x^2m\right)$
$\lim_{x\to\infty}\left(ln\left(4x\right)-ln\left(x+8\right)\right)$
$n+5+3-2n$
$27x^7\:+\:54x^6\:+\:64x\:+\:128$
$-\:4\:-\:\left(5\:-\:7\right)\:-\:\left(4\:-\:5\right)$
$-2x-15\ge90$
$ydy-6xdx=0$
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