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x in (-oo:+oo)
-33 = 3*x-(6*x)-6 // - 3*x-(6*x)-6
6*x-(3*x)-33+6 = 0
6*x-3*x-33+6 = 0
3*x-27 = 0 // + 27
3*x = 27 // : 3
x = 27/3
x = 9
x = 9
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