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c in (-oo:+oo)
(2/12)*c-((5/12)*c)+4/12+10/12 = 0
(2/12)*c+(-5/12)*c+4/12+10/12 = 0
7/6-1/4*c = 0 // - 7/6
-1/4*c = -7/6 // : -1/4
c = -7/6/(-1/4)
c = 14/3
c = 14/3
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