$-4\:\left(2x+4\right)$
$\left(6a-4b\right)^3$
$an-am=a$
$\frac{7x-13}{2x^{2}-8x+6}$
$\frac{7^7\cdot\left(3^4\right)^3}{21^9}$
$\log\left(2x^ay\right)$
$a^2-b^2n^6$
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