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x in (-oo:+oo)
-(1/3-x) = 3*x-(4/3) // - 3*x-(4/3)
x-(3*x)-(1/3)+4/3 = 0
x-3*x-1/3+4/3 = 0
1-2*x = 0 // - 1
-2*x = -1 // : -2
x = -1/(-2)
x = 1/2
x = 1/2
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