$\frac{2x^2-\left(x^2+1\right)\ln\left(x^2+1\right)}{x^2+1}$
$\left(6x-5\right)\left(2x+3\right)g$
$4\left(z+5\right)+8z$
$11r+12r-4r$
$7-6\left(7\right)+9\left(7\right)+9$
$\left(x-2ax\right)\left(x-3bx\right)$
$\int_0^{16}xdx$
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