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x in (-oo:+oo)
(1/3)*x-(1/9) = 3 // - 3
(1/3)*x-(1/9)-3 = 0
(1/3)*x-1/9-3 = 0
1/3*x-28/9 = 0 // + 28/9
1/3*x = 28/9 // : 1/3
x = 28/9/1/3
x = 28/3
x = 28/3
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