$6x^4-3x^4+7x^4$
$\left(-2\right)\:x\:\left(+3\right)$
$3y\cdot\left(-3y\right)$
$\left(m^5n^4\right)\left(m^3n^{10}\right)$
$\left(2w^2\right)^3$
$3a\:+\:2\:cuando\:es\:=\:5$
$4x^2-16x^2y^2$
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