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c in (-oo:+oo)
12 = (c-6)/12 // - (c-6)/12
12-((c-6)/12) = 0
(-1*(c-6))/12+12 = 0
(-1*(c-6))/12+(12^2)/12 = 0
144-1*(c-6) = 0
150-c = 0
(150-c)/12 = 0
(150-c)/12 = 0 // * 12
150-c = 0
150-c = 0 // - 150
-c = -150 // * -1
c = 150
c = 150
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