$x^2-8x+20=5$
$4+3\cdot2^4+2\left(4^2-3\right)$
$6x^5\left(x^3-4x\right)$
$\frac{2a^3}{2b^2}b^2$
$a^2+6ab$
$20x^2+7x-6$
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