$\frac{x^2-3x-28}{x^2-16}$
$x^2-37x+127=0$
$-5\left(yz+3\right)-7yz+1+y^2$
$\left(x^{2}-15x+56\right)+\left(x-8\right)$
$x\left(x^2-x+2y\right)+y\left(y^2-x\right)-y$
$2x-8xy^2$
$x^2+18x+5=0$
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