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x in (-oo:+oo)
(2/3)*(x-9) = 9 // - 9
(2/3)*(x-9)-9 = 0
2/3*(x-9)-9 = 0
2/3*(x-9)-9 = 0
2/3*x-15 = 0
2/3*x-15 = 0
2/3*x-15 = 0 // + 15
2/3*x = 15 // : 2/3
x = 15/2/3
x = 45/2
x = 45/2
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