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c in (-oo:+oo)
12 = (c-6)/2 // - (c-6)/2
12-((c-6)/2) = 0
(-1*(c-6))/2+12 = 0
(-1*(c-6))/2+(2*12)/2 = 0
2*12-1*(c-6) = 0
30-c = 0
(30-c)/2 = 0
(30-c)/2 = 0 // * 2
30-c = 0
30-c = 0 // - 30
-c = -30 // * -1
c = 30
c = 30
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