$18x^2+7x^2$
$\frac{512a^9+b^9}{1-a}$
$\int xe^{8y}dx$
$2\sin\left(x\right)=-1.36$
$\left(4m+3\right)\left(4m-7\right)$
$\left|-5\right|-\left|-8\right|$
$5r-7r$
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