$\left(2a+1\right)\left(2a+5\right)$
$x4-4>0$
$\left(ab+bc-cd\right)\left(ab+bc+cd\right)$
$8m^2n^5-12mn^4+20m^4n^6$
$2x^2+y^2=8$
$2x^2-x=-5$
$2+-7\:\left(-4\right)$
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