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x in (-oo:+oo)
(5/6)*x = (1/3)*x-(2/3) // - (1/3)*x-(2/3)
(5/6)*x-((1/3)*x)+2/3 = 0
(5/6)*x+(-1/3)*x+2/3 = 0
1/2*x+2/3 = 0 // - 2/3
1/2*x = -2/3 // : 1/2
x = -2/3/1/2
x = -4/3
x = -4/3
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