$2r+3s-5r$
$3x+1=3x$
$\frac{dy}{dt}+y=3t^2$
$\left(2x^2y\:+\:3x\right)^2$
$\int\frac{x}{\sqrt{-59-4x^2+32x}}dx$
$6-5b>21$
$2x^2+y^2=8$
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