$\int\frac{x}{\sqrt{9x-x^2}}dx$
$-9x\:6x\:-2$
$\sqrt{144}\cdot\left(-2\right)+3\left|-1-\left(-4^3\right)-64\right|-\left(-7^2\right)$
$\left(a+2\right)\left(a+1\right)-4\left(a+1\right)$
$100x^2+25x$
$x^2-18x+16+8x^2+25x-16$
$-48:-2$
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