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c in (-oo:+oo)
7/10 = c/50 // - c/50
7/10-(c/50) = 0
7/10-1/50*c = 0 // - 7/10
-1/50*c = -7/10 // : -1/50
c = -7/10/(-1/50)
c = 35
c = 35
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