$\left(xy2+2z\right)\left(xy2-5z\right)$
$4\log x-2\log\left(x-3\right)$
$y=\left(u^2-u\right)\left(\frac{1}{x}\right)$
$8-3k=3k+2$
$5\cdot4+6$
$\left(4x-2\right)\left(4x+8\right)$
$\left(-121\right)\left(0\right)$
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