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x in (-oo:+oo)
x-(2/3) = 3*x-(9/6) // - 3*x-(9/6)
x-(3*x)-(2/3)+9/6 = 0
x-3*x-2/3+9/6 = 0
5/6-2*x = 0 // - 5/6
-2*x = -5/6 // : -2
x = -5/6/(-2)
x = 5/12
x = 5/12
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