$\left(2x-5\right)\left(x-3\right)$
$5x^2-y^2-9=0$
$xy-x^{1.7}y^{2.2}$
$\left(wz-5\right)\left(wz+9\right)$
$\left(x^{2}-5x+6\right)+\left(3x^{2}-8x-2\right)$
$4+x^4+4x^2$
$-3+n-10n$
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