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