$cos2x+3cosx+2=0$
$\left(x\:-3\right)\left(x-1\right)\:$
$y'+x^2-1=y$
$4x-7=5$
$5n^2-340n$
$\sqrt{4x^2y^3}$
$y+9+7\left(y+7\right)$
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