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c in (-oo:+oo)
7/2 = c/12 // - c/12
7/2-(c/12) = 0
7/2-1/12*c = 0 // - 7/2
-1/12*c = -7/2 // : -1/12
c = -7/2/(-1/12)
c = 42
c = 42
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