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c in (-oo:+oo)
25/60 = c/12 // - c/12
25/60-(c/12) = 0
5/12-1/12*c = 0 // - 5/12
-1/12*c = -5/12 // : -1/12
c = -5/12/(-1/12)
c = 5
c = 5
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