$y'\:+\:4y\:=\:3\:sen\:2x$
$12a-12b$
$\left(b-9\right)\cdot\left(b-4\right)$
$56\cdot64$
$\left(\sqrt{7}-\sqrt{8}\right)\left(\sqrt{8}+\sqrt{7}\right)$
$m\:x\:5m\:x\:4m$
$\left|\left(2x+1\right)^2\right|$
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