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x in (-oo:+oo)
1/3 = x/81 // - x/81
1/3-(x/81) = 0
1/3-1/81*x = 0 // - 1/3
-1/81*x = -1/3 // : -1/81
x = -1/3/(-1/81)
x = 27
x = 27
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