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