$9x^2-9$
$9x^2=25$
$3y-x+5;\:x=2;\:y=-1$
$3125a^{\frac{2}{5}}=5$
$t\frac{dy}{dt}=t^3+10t^3y$
$\left(x^3-12\right)\left(x^3+3\right)$
$2x\cdot x^4$
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