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c in (-oo:+oo)
(-7/8)*c+1 = 4 // - 4
(-7/8)*c-4+1 = 0
-7/8*c-3 = 0 // + 3
-7/8*c = 3 // : -7/8
c = 3/(-7/8)
c = -24/7
c = -24/7
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