$\left(x-3\right)y'-3y=0$
$y\frac{dy}{dx}=1-v$
$sqrt\left(1+\left(\frac{2x^{\left(\frac{2}{5}\right)}}{5}+4x\right)\right)$
$7m\ge21$
$\left(-7\right)\left(-7\right)$
$a^2-b^2+c^2-d^2;a=0,b=2,c=-1,d=-2$
$-12a\left(m-n+1\right)\:+\:\left(-m+n-1\right)\:+m\:\left(6m+6n+6\right)$
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