$\left(2a+9\right)\:\left(2a-9\right)$
$2x^3+2x^2$
$2\:-1\:-10\:-7$
$\frac{x^{8m}-9}{x^{4m}-3}$
$\frac{x^2}{49}+\frac{y^2}{9}=1$
$\int\frac{e^x}{\left(2-e^x\right)^2}dx$
$x+1\:-\:x+3$
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