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c in (-oo:+oo)
(7/8)*c = -(21/16) // + 21/16
(7/8)*c+21/16 = 0
7/8*c+21/16 = 0 // - 21/16
7/8*c = -21/16 // : 7/8
c = -21/16/7/8
c = -3/2
c = -3/2
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