$-3x^2y+xy-7x^2y+3xy-x^2y^2+2xy+5$
$z=x^2-y^3$
$\log\left(x\right)=\log\left(x-8\right)+\log\left(3\right)$
$3x\:+\:2y-4z\:+\:2x-3y\:+\:3z-4x\:+\:5y\:+\:7z$
$750+50x>1000$
$\lim_{x\to0}\left(\frac{x+sen^2x}{x-sen^2x}\right)$
$\left(5\:b^6\:\right)^{10}$
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