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c in (-oo:+oo)
4 = c/1337 // - c/1337
4-(c/1337) = 0
4-1/1337*c = 0 // - 4
-1/1337*c = -4 // : -1/1337
c = -4/(-1/1337)
c = 5348
c = 5348
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