$t\frac{dy}{dt}+2y-t^2=0$
$x^3+ax^2-ax^2-ax^2+ax^2+a^3$
$\frac{a^3}{a^5}$
$-2<-\frac{3y}{5}+2$
$x^2+10x+35=0$
$64a^3-125b^9$
$\left(-m^2n+3mn\right)^2$
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