$\left(3x+4\right)\left(2x+1\right)$
$\frac{2}{3}\cdot\frac{2}{c}$
$-7x-7y$
$\left(-6\right)\left(-7\right)$
$k=\frac{-sen^2x}{2senx\:cosx}$
$x^3-12x-16$
$\frac{2x^2}{9}=18$
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