$-3x+2a+\left(x-a\right)-\left(2x+a\right)$
$\int\left(\frac{e^{2x}}{e^{2x}+9}\right)dx$
$-5\cdot10$
$\lim_{x\to\infty}2^{-x}$
$\left(-8\right)\left[\left(-3\right)+\left(-1\right)\right]-6\left(-1\right)$
$\frac{dy}{dx}=\frac{8y}{\left(9-x^2\right)}$
$m+14\:\cdot11$
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