$\frac{r}{5}-1>2$
$2x-4=4x+2$
$-2x-\frac{1}{3}x$
$y=5x^2\left(6x+2\right)^3$
$\cos\left(\frac{3}{5}+\frac{5}{13}\right)$
$\left(-6m^2n^4\right)\left(-8m^7n^5\right)$
$\left(x^2-2\right)\left(x-1\right)\left(x^2-x+1\right)$
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