$\:5\:+\:15\::\:5$
$3^6\cdot3^7$
$-12xy^2z^7-12z^4$
$26+29,845$
$\left(2a^2-8b^2\right)\left(2a^2-16a^2b^2+8b^2\right)$
$2x\left(x+1\right)-x\left(x-1\right)$
$\frac{1+\cos\:\left(x\right)+\sin\:\left(x\right)}{1+\cos\:\left(x\right)-\sin\:\left(x\right)}$
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