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x in (-oo:+oo)
(2/3)*x = 9-x // - 9-x
(2/3)*x+x-9 = 0
5/3*x-9 = 0 // + 9
5/3*x = 9 // : 5/3
x = 9/5/3
x = 27/5
x = 27/5
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