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