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c in (-oo:+oo)
((1/6)*c-12)*((2/3)*c+6) = 0
(1/6*c-12)*(2/3*c+6) = 0
( 1/6*c-12 )
1/6*c-12 = 0 // + 12
1/6*c = 12 // : 1/6
c = 12/1/6
c = 72
( 2/3*c+6 )
2/3*c+6 = 0 // - 6
2/3*c = -6 // : 2/3
c = -6/2/3
c = -9
c in { 72, -9 }
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