$5x-11y-9+20-1-y$
$y^2\:\frac{dy}{dx}=1$
$2\left(-3+7-1\right)$
$\left(p+q-r\right)x$
$\int sec\left(u\right)tan\left(u\right)du$
$4x^3-8x^2-4x+8$
$7.2x-4+x-1.7$
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