$4\left(5b\right)$
$2x^2+2y^2$
$x\left(\sqrt{x^2+1}-x\right)$
$y=-20x^{-5}$
$x-11+18-20$
$\frac{x^3-x^2+2x+6}{x-3}$
$\left(ax+b\right)^3$
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