$8x\:+\:y\:+\:z\:+\:u\:+\:-3x\:-4y\:-2z\:+3u+4x\:+\:5y\:+\:3z\:-4u\:\:\:+9x\:+\:y\:+z\:+\:2u.$
$w^2-23w+120$
$\frac{1}{4}x^6+y^{-6}$
$7x+3x^2+12x^2$
$14x^2y\:-\:\left(7xy\right)$
$4x^2+55x+36$
$\int-6xcos3xdx$
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