$\left(x-3y\right)-\left(2y-5x\right)$
$y''+2y'-3y=0$
$\lim\:_{x\to\:\infty\:}\left(\frac{x}{3x^3+1}\right)$
$\lim_{x\to0}\left(\frac{2x-3\cdot sen\left(x\right)+x\cdot cos\left(x\right)}{x^5}\right)$
$x^2+12x+4$
$8-1000$
$\left(\frac{x}{7}+\frac{2}{7}\right)\left(\frac{x}{7}+\frac{2}{7}\right)$
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