$\int_{e^2}^{\infty}\frac{9\ln\left(x\right)}{x}dx$
$\int\frac{8x+2}{x^2+6x-16}dx$
$\frac{3}{\left(1-x\right)\left(1+2x\right)}$
$2 x ^ { 2 } + 3 x + 1 = 0$
$x+2=3x+8$
$\frac{x+1}{x-1}+2>\:0$
$18-x<21x-26$
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