$121x^4-144x^8$
$0.1x+0.7<2x-1.2$
$4x^2-9y^{10}z^2$
$-30+18-7+1-5\:-6+-7$
$\left(e^y-1\right)y'=2+cosx$
$\frac{dy}{dx}=\frac{1}{3y^2}$
$13+2$
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