$5x-55=0$
$3tg^2x=sec^2x+1$
$11m-2m$
$4ab-4a$
$\int7x^9dx$
$\int_{10}^x\:\frac{3\left(x-5\right)^2}{875}dx$
$\lim_{x\to9}\left(\frac{x^2-2x-63}{x-9}\right)$
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