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r in (-oo:+oo)
6561 = 729*(1/3)*r // - 729*(1/3)*r
6561-(729*(1/3)*r) = 0
6561-243*r = 0
6561-243*r = 0 // - 6561
-243*r = -6561 // : -243
r = -6561/(-243)
r = 27
r = 27
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