$\left(x-7\right)\left(+7\right)=x^2+49$
$\log_w\left(3\right)\cdot\log_w\left(3\right)$
$\lim_{x\to2}\left(\frac{x^2-4x^3+4x^2}{x-2}\right)$
$\frac{x^{8}-1}{x+1}$
$\sqrt[4]{625x^8}y^{16}z^{20}$
$3-2^2-1\cdot3$
$x^2+8x-84=0$
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