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x in (-oo:+oo)
(2/3)*x-(1/3) = 4/3 // - 4/3
(2/3)*x-(1/3)-(4/3) = 0
(2/3)*x-1/3-4/3 = 0
2/3*x-5/3 = 0 // + 5/3
2/3*x = 5/3 // : 2/3
x = 5/3/2/3
x = 5/2
x = 5/2
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