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x in (-oo:+oo)
-1 = 9-((2/3)*x) // - 9-((2/3)*x)
(2/3)*x-9-1 = 0
2/3*x-10 = 0 // + 10
2/3*x = 10 // : 2/3
x = 10/2/3
x = 15
x = 15
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