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