$x^2-4x+20$
$\left(7x+2y-4\right)+\left(9y-6z+5\right)$
$\left(-23+33\right)\cdot\left(-10\right)$
$\sqrt{28x^5}$
$\left(5y+4\right)\left(5y-4\right)$
$\sqrt{-45}$
$\left(4x^2+xy-3y\right)+\left(xy+y-x\right)$
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