$\lim_{x\to\infty\:}\left(7+\frac{1}{x}\right)$
$25x^2\:=\:15\:-\:17x$
$\left(8-3\right)\left(4-1\right)$
$10-\left(p-6\right)$
$-n-m+x\left(m+n\right)$
$4x^2-96x-576$
$6x+y+3z=30$
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