$1-\frac{u}{u-1}$
$z^2-11z+28$
$\left(x+4\right)^{2}-\left(x-1\right)^{2}$
$\frac{d^2}{dx^2}\left(-7x^3-13y^5=3\right)$
$\left(6x^3-y^2\right)^2$
$x^2+20x+81\:=\:113$
$x^2-4x+1^2$
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