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c in (-oo:+oo)
12 = (c-4)/11 // - (c-4)/11
12-((c-4)/11) = 0
(-1*(c-4))/11+12 = 0
(-1*(c-4))/11+(11*12)/11 = 0
11*12-1*(c-4) = 0
136-c = 0
(136-c)/11 = 0
(136-c)/11 = 0 // * 11
136-c = 0
136-c = 0 // - 136
-c = -136 // * -1
c = 136
c = 136
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