$3^2.2^3.3^3$
$\left(-7-8\right)\cdot9$
$7x+4x^2-3\:entre\:x-3$
$6x^2-4x+3$
$m^2+2mn+n\:^2$
$9\sqrt{15x^4}.\sqrt[9]{15x^2}$
$20x-2\left(10x+6\right)+x-4+2\left(x+4\right)-5$
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