$-79+-83$
$x^2+x+6\le0$
$25a^2-b^2$
$\lim_{x\to\infty}\left(\frac{3-x}{x+1}\right)$
$4x+2=26$
$10+2b=7b-15$
$\int\:sen\left(\frac{2x}{3}\right)cos\left(\frac{5x}{17}\right)dx$
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