$4x^2-10xy-12y^2$
$2x\:+\:6\:=\:48$
$89\cdot66$
$\frac{2x-x+1}{x}$
$24x^3-16^2+8x$
$\lim_{x\to-1}\left(\frac{4x^4+7x^3+6x+9}{x+1}\right)$
$6x-12-\frac{1}{4}x^2-7x+8$
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