$\int_e^{\frac{1}{e}}lnx\:dx$
$-\:6\:-\:\:-\:4\:-\:\left[\:-\:3\:-\:\left(\:1\:-\:6\:\right)\:+\:5\:\right]\:-\:8\:\:-\:9\:$
$-x^2+x+2<0$
$\left(7xy^3-2y\right)\left(7a^3+2abc\right)$
$\left(-2\right)^4\left(-2\right)^2$
$-3y\left(3y\right)\left(-8\right)$
$4x^2-12x+9x$
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