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