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c in (-oo:+oo)
4 = (5/14)*c // - (5/14)*c
4-((5/14)*c) = 0
(-5/14)*c+4 = 0
4-5/14*c = 0 // - 4
-5/14*c = -4 // : -5/14
c = -4/(-5/14)
c = 56/5
c = 56/5
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