$2r\le56$
$\frac { 2 n - 2 n } { 2 n }$
$x^4-2x^3-11x^2$
$\frac{dy}{dx}+4y=x^2$
$49y^6-112x^3y^3+64x^6$
$x^2+x-21$
$\left(-2x^{-4}\right)^{-1}\cdot x^{-3}x^0$
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