$20y^2-18y^2$
$\sqrt{\frac{1}{3u^3}}$
$4xy+8x+7y-7x+10\:y-7xy$
$\frac{4.2^6}{4.2^5}$
$\sqrt{81a^{12}}$
$x^2-5x-5=0$
$13-\left(7-7\cdot4\right)+16$
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