$2x-x+5x-9x=\:$
$\int\left(\frac{6}{x}+3x^{\frac{1}{3}}-3e^x\right)dx$
$\lim_{t\to0}\left(\frac{\sqrt{1+t}}{t}\right)$
$\left(n+7\right)+\left(n-5\right)+\left(n+4\right)$
$\frac{6x^4-5x^3+x^2+x-2}{3x^3-3x+1}$
$\frac{y-1}{y\left(y+2\right)\left(y-2\right)}dy=\frac{2x}{x^2+2}dx$
$7\cdot b=-210$
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