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x in (-oo:+oo)
(5/9)*x = 5/81 // - 5/81
(5/9)*x-(5/81) = 0
(5/9)*x-5/81 = 0
5/9*x-5/81 = 0 // + 5/81
5/9*x = 5/81 // : 5/9
x = 5/81/5/9
x = 1/9
x = 1/9
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