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