$\left(x+5\right)\cdot\left(x+4\right)$
$415,9+2,37$
$5x\:-13\:=\:43\:-\:2x$
$b^2-7b^2-260$
$81x^{2}-36x+4$
$\int_0^1\left(6lnx\right)dx$
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