$\frac{2x^3-3x^2-5x+1}{x-2}$
$4x^2+6x\:5$
$\int\frac{7}{x^2+7x}dx$
$19x-57+9y-9-z+30$
$11\left(1m\:+\:1n\right)\:-\:2m\:\left(1m-1n\right)$
$+78-715$
$5x^2+2xy;\:x=1;\:y=2$
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