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x in (-oo:+oo)
(2/3)*x-3 = 6 // - 6
(2/3)*x-6-3 = 0
2/3*x-9 = 0 // + 9
2/3*x = 9 // : 2/3
x = 9/2/3
x = 27/2
x = 27/2
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