$x^3-6x+9$
$\left(7p^2q\:+\:3s^3\right)\:\left(7p^2q\:-\:3s^3\right)$
$81-9x^{12}y^6$
$\left(275-2x\right)\left(200-2x\right)x$
$-\frac{1}{4}\left(-8x+12y\right)$
$564\:\:-\:\:\left(-\:4\:5\:\right)\:-\:\left(\:-\:23\:\right)$
$\frac{3}{2}x-2,5=5+\frac{1}{4}x$
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