$-6\:-\:\left(-27\right)\:$
$3x+21=72$
$\left(x-1\right)\frac{dy}{dx}=x$
$\frac{dx}{dt}=\sqrt{1-2x}$
$\frac{dv}{dx}=\frac{1+v}{1-v}-v$
$2x^2-4x+5=6$
$6z^2+2z$
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