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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+4/3 = 0 // - 4/3
2/3*x = -4/3 // : 2/3
x = -4/3/2/3
x = -2
x = -2
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