$3x^2\left(x-5\right)-2x\left(3x+1\right)+3x\left(x^2+3x-1\right)$
$\left(a+1\right)\left(a-1\right)+\left(a-1\right)^2$
$\lim_{x\to\infty}\left(\frac{x+2e^{2x}}{3x^2+2e^{2x}}\right)$
$2\left(3x-1\right)+2x=6$
$\frac{18x^3+15x^2+21x+11}{6x+3}$
$\int\frac{x-9}{x^2+3x-1}dx$
$\int - 3 x ^ { 7 } d x$
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