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