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