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c in (-oo:+oo)
(2/8)*c-((1/8)*c)+4/8+6/8 = 0
(2/8)*c+(-1/8)*c+4/8+6/8 = 0
1/8*c+5/4 = 0 // - 5/4
1/8*c = -5/4 // : 1/8
c = -5/4/1/8
c = -10
c = -10
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