$\left(4-7\right)+\left(3-\left(-5+8\right)+6\right)$
$x\frac{dy}{dx}+\frac{2x+1}{x+1}=x-1$
$\left(3a+5b\right)\left(3ax-5b\right)$
$-3\left(4g^2+9\right)$
$dr-rdx=0$
$\int\frac{2x^2-x+1}{\left(x-2\right)\cdot\left(x+1\right)}dx$
$x^2\:y+xz^2+y^2\:z\:+14\:+\:12$
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