$\left(7x+6y\right)\left(11x-3y\right)$
$a^2+6a+9=0$
$-6x>12$
$\int sen^n\left(mx\right)cos\left(mx\right)dx$
$100m^{10}n^2-169y^8$
$\left(-3\sqrt{x-2}+x\right)\left(x^2+9\right)$
$\int\left(\frac{3w^3-5w^4+7}{11w^4}\right)dw$
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