$x+\frac{6}{x}=-7$
$\sin\left(w\left(x-a\right)\right)$
$sen\left(x\right)=\sqrt{1-cos^2\left(x\right)}\cdot\sqrt{1-sen^2\left(x\right)}$
$6xn+9xm-12xf$
$-7x=-28$
$0.68-0$
$\frac{8a^3b^2c}{2a^5b}$
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