$-18x\:\:\:=72$
$3\infty-1$
$\left(8+x^3\right)\left(x^3-9\right)$
$2a\sqrt{3}+3a\sqrt{3}+5a\sqrt{3}$
$y'=21+18x+21y+18xy$
$\frac{d}{dx}y-1$
$19\cdot15\cdot150$
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