$-\sqrt{63}$
$\left(a-\sqrt{b}\right)^4$
$7x'+10x=20$
$\left(2m^2+3n^2+3mn\right)\left(2m^2+3n^2-3mn\right)$
$16x^8-81y^4$
$34ab+18ab+2ab$
$-2\left(4x+2\right)$
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