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x in (-oo:+oo)
(1/3)*(6*x-9) = 3*x // - 3*x
(1/3)*(6*x-9)-(3*x) = 0
(1/3)*(6*x-9)-3*x = 0
1/3*(6*x-9)-3*x = 0
1/3*(6*x-9)-3*x = 0
-x-3 = 0
-x-3 = 0
-x-3 = 0 // + 3
-x = 3 // * -1
x = -3
x = -3
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