$\int_2^{-4}\left(4+x\right)-\left(2-x\right)dx$
$\int-7e^{-6t-3}dt$
$35+x-6x^2$
$\sqrt[2]{x}+4=9$
$\left(xy+2\right)\left(xy+4\right)$
$a^2+a-2>\frac{1}{2}$
$2.5a^{2}-0.4a-3.6a^{2}+4a-1$
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