$\left(+x+y+z\right)-\left(-x-y-z\right)$
$\frac{2}{5}x-y^4\:\:^3$
$\left(x-2\right)^2+5x-16<0$
$\frac{x+y}{x}$
$7x^2+3x+6=-8x-8$
$6x^5-12x^4+2x^3$
$\left(4w+12\right)\left(w-12\right)$
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