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x in (-oo:+oo)
(1/3)*x+2/3 = (5/3)*x // - (5/3)*x
(1/3)*x-((5/3)*x)+2/3 = 0
(1/3)*x+(-5/3)*x+2/3 = 0
2/3-4/3*x = 0 // - 2/3
-4/3*x = -2/3 // : -4/3
x = -2/3/(-4/3)
x = 1/2
x = 1/2
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