$2x+20=-2x-4$
$\lim_{x\to0}\left(1+\frac{1}{x}\right)^{\frac{x}{6}}$
$\frac{3x^3+2x^2-19x+7}{x+3}$
$x^2-6x+7=0$
$\int\left(\frac{x^5}{1-x}\right)dx$
$\int e^{3x}\:sen\left(\frac{x}{3}\right)dx$
$\int\left(4cos\left(7x\right)\right)dx$
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