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$\int\left(\frac{2}{\left(x^2+4x+7\right)}\right)dx$
$591-7+6-8+1-2+3-1+6-8$
$\left(2a+9b\right)^2$
$\int\frac{x^2-4x+6}{x^3-6x^2+18x}dx$
$x^2-8+15$
$3\left(-2\right)^2$
$\left(-4\right)-\left(-16\right):2$
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