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c in (-oo:+oo)
12/36 = (2*c)/6 // - (2*c)/6
12/36-((2*c)/6) = 0
(-1/3)*c+12/36 = 0
1/3-1/3*c = 0 // - 1/3
-1/3*c = -1/3 // : -1/3
c = -1/3/(-1/3)
c = 1
c = 1
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