$-6mn+9$
$\frac{-u+1}{-u-1}$
$\int_{-2}^24\left(6x+4\right)^7dx$
$\lim_{x\to2}\left(\frac{x^3+2x^2-1}{5-3x}\right)$
$2x+x+2x+x$
$\left(7^3\right)^5\:x\:7^{-18}$
$2^5+2^6$
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