$\frac{x}{2}-7=-10$
$257^2$
$\frac{7}{\left(x+1\right)}\:=\:\frac{5}{\left(x-1\right)}$
$\left(x^2-\frac{y^2}{2}\right)$
$6+2\cdot3-1$
$\int sen\left(2x\right)cos\left(x\right)dx$
$\frac{d^4}{dx^4}\left(x^2+e^x\right)$
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