$0=5$
$8-p+9$
$5a^2\:-\:45b^4$
$4\left(2-2\right)+21$
$x^2-2=8x$
$\frac{dy}{dx}=\frac{x-3y}{-3x+y}$
$22.1+31.41+33.41+5.25$
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