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x in (-oo:+oo)
3*(x-(4/3)) = 3*x+y // - 3*x+y
3*(x-(4/3))-(3*x)-y = 0
3*(x-4/3)-3*x-y = 0
3*(x-4/3)-3*x-y = 0
-y-4 = 0
-y-4 = 0
x belongs to the empty set
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