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x in (-oo:+oo)
(2/3)*x-2 = 9 // - 9
(2/3)*x-9-2 = 0
2/3*x-11 = 0 // + 11
2/3*x = 11 // : 2/3
x = 11/2/3
x = 33/2
x = 33/2
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