$-\left(x+y\right)+\left[3x-2y-8x-5x-\left(6x-8y-7y\right)-6x\right]$
$\int\sec^2\frac{3x}{2}dx$
$\sqrt{20}+\sqrt{5}$
$x\cdot y=4$
$\frac{dy}{dx}+\:7e^{x+y}=0$
$c\left(c-8\right)+2c\left(c+3\right)$
$3ab^2+4ab^2-7ab^2$
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