$4+2\left(5-3\right)+4-3\left(8-5\cdot2\right)$
$\frac{2x^2-x-28}{20-x-x^2}$
$-4y^2+4y$
$\left(\frac{3z^6}{5}\right)^2$
$19x^4-6x^4+4x^4$
$9x^2+225$
$4^2+4^{-2}$
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