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