$-4\:\left(\:-7+\:11\:\right)$
$\sqrt{21-7}$
$x^2-28x$
$\left(3\right)\cdot\left(8\right)\cdot\left(4\right)\cdot\left(-1\right)$
$\left(e-11n\right)^2$
$\int x\left(e^{2x}+9^{3x}\right)dx$
$-26+12+14-26-30+7-40+46+12$
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