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c in (-oo:+oo)
7/2 = c/(8/7) // - c/(8/7)
7/2-(c/(8/7)) = 0
(-7/8)*c+7/2 = 0
7/2-7/8*c = 0 // - 7/2
-7/8*c = -7/2 // : -7/8
c = -7/2/(-7/8)
c = 4
c = 4
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