$20\cdot5y^2$
$8+-12\cdot\sqrt{12^2}$
$100a^4-60^2b+9b^2$
$\left(2x^2+4y^2\right)^2$
$x^2-4x=-2$
$x^{4}-5x^{3}-10x^{2}+15x\text{entre}-5x$
$-2x^3-4x^{-3}$
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