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n in (-oo:+oo)
27^4-n = (1/3)^5*n // - (1/3)^5*n
27^4-n-((1/3)^5*n) = 0
531441-244/243*n = 0 // - 531441
-244/243*n = -531441 // : -244/243
n = -531441/(-244/243)
n = 129140163/244
n = 129140163/244
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