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c in (-oo:+oo)
c/12 = 30/120 // - 30/120
c/12-(30/120) = 0
c/12-1/4 = 0
1/12*c-1/4 = 0 // + 1/4
1/12*c = 1/4 // : 1/12
c = 1/4/1/12
c = 3
c = 3
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