$3xy-2xy+xy$
$\left(x^2-4x+10\right)^2$
$\left(5x^3y^4\right)^2$
$\left(\sqrt{b}\right)\left(\sqrt{b}\right)$
$\frac{dy}{dx}-4y=e^{4x}\left(-3+2x\right)$
$25a+30a$
$x2\:-\:87x\:+\:1820\:=\:0$
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