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c in (-oo:+oo)
(1/3)*(c-9) = -6 // + 6
(1/3)*(c-9)+6 = 0
1/3*(c-9)+6 = 0
1/3*(c-9)+6 = 0
1/3*c+3 = 0
1/3*c+3 = 0
1/3*c+3 = 0 // - 3
1/3*c = -3 // : 1/3
c = -3/1/3
c = -9
c = -9
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