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a in (-oo:+oo)
a/27 = 18/81 // - 18/81
a/27-(18/81) = 0
a/27-2/9 = 0
1/27*a-2/9 = 0 // + 2/9
1/27*a = 2/9 // : 1/27
a = 2/9/1/27
a = 6
a = 6
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