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c in (-oo:+oo)
(7/12)*c+(5/16)*c = c+15/48 // - c+15/48
(7/12)*c+(5/16)*c-c-(15/48) = 0
(7/12)*c+(5/16)*c-c-5/16 = 0
-5/48*c-5/16 = 0 // + 5/16
-5/48*c = 5/16 // : -5/48
c = 5/16/(-5/48)
c = -3
c = -3
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