$30x+17x-21$
$2x^3+7x-9$
$\left(4x+5b\right)^3$
$80x^2y^4+320x^4y^6$
$4x-8<6$
$2\cdot\frac{dy}{dx}+x^2\cdot y=0$
$2x^4-2yx^2$
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