$7x-3y+4z-12x+5y+2z-8y-3z$
$\int\frac{2x-1}{x^2-4x+4}dx$
$16y^{2}-25$
$1-1-1+1+1+-1-1+-1+1$
$\frac{x^2-6x+9}{x-3}$
$\left(2x-3y-4z\right)\left(x+y+z\right)$
$4r^{2\:}+20r+25$
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