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x in (-oo:+oo)
(2/3)*x-1 = 9-((1/6)*x) // - 9-((1/6)*x)
(2/3)*x+(1/6)*x-9-1 = 0
5/6*x-10 = 0 // + 10
5/6*x = 10 // : 5/6
x = 10/5/6
x = 12
x = 12
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