$x-2xy\left(-x+6xy\right)-\left(4x+3x^2y\right)$
$2\left(-y-4z\right)-5\left(6z-6y\right)$
$\lim_{x\to\infty}\frac{x^4+5x^2-x}{x^5-4x^3}$
$\frac{n\:-\:-47}{8}\:=\:10$
$sen2x\:+sen2x\:\cdot tan2x=tan2x$
$t^2+19t-20<0$
$\int\sqrt{x}\left(x-2\right)dx$
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