$\left(\sqrt{2y}-\sqrt{8y}\right)^2$
$\log\left(7x-4\right)=\log\left(x+2\right)+\log8$
$cm^2\cdot cm$
$36x^2-6xy-9y^2$
$-\left(\frac{1}{2}\right)^{-2}$
$5x\:+\:3x\:+\:5\:\:3$
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