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c in (-oo:+oo)
(61/2)*c = 7-(1/2) // - 7-(1/2)
(61/2)*c+1/2-7 = 0
61/2*c-13/2 = 0 // + 13/2
61/2*c = 13/2 // : 61/2
c = 13/2/61/2
c = 13/61
c = 13/61
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