$\:\left(-9\right)-\left(+8\right)-\left(-1\right)-\left(+13\right)-\left(-25\right)$
$\int\cos\left(2n+2m-2\right)xdx$
$-\left(6x-2\right)+7x$
$-\left(4+\right)\left(3^2-6\right)$
$\frac{6x^3+11x^2-23x+42}{2x+7}$
$\int2e^{2t+6}dx$
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