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c in (-oo:+oo)
(c-12)/7 = -6 // + 6
(c-12)/7+6 = 0
(c-12)/7+(6*7)/7 = 0
c+6*7-12 = 0
c+30 = 0
(c+30)/7 = 0
(c+30)/7 = 0 // * 7
c+30 = 0
c+30 = 0 // - 30
c = -30
c = -30
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