$x-7=2x+1$
$cos\left(x-\frac{\pi}{2}\right)=senx.$
$\left(8\right)\left(-14\right)$
$3z^2\:y\cdot5z^2\:y$
$x+5\le-3$
$x^2+121x+169$
$\frac{4y^5+5y^3}{y^4-y^2}$
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