$\left(3w+7\right)\left(3w+4\right)$
$x^2-\frac{9}{5}x$
$\int\frac{1}{\pi x\left(x^2+1\right)}dx$
$x^4+4x^3-16x$
$2\left(6\right)\left(5\right)+2\left(3\right)\left(5\right)+\left(6\right)\left(3\right)$
$-2\left(x-1\right)\left(x+1\right)$
$\frac{x+8}{-2}>0$
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