$\frac{2}{5}a-\frac{3}{5}+\frac{1}{10}a$
$\frac{2sen^2\theta\:+3sen\theta\:-2}{sen\theta\:+2}$
$\left(-3\right)^5.9^3$
$6m+14-11+3m$
$y=\left(5+8x^{-3}\right)\left(-5x^2+2-4x\right)$
$\left(10mn^2+13y^3\right)\left(10mn^2-13y^3\right)$
$\left(8w^{-3}+z^{-2}\right)\left(8w^{-3}-5z^{-2}\right)$
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