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c in (-oo:+oo)
(1/3)*(c-6) = (1/9)*c // - (1/9)*c
(1/3)*(c-6)-((1/9)*c) = 0
(1/3)*(c-6)+(-1/9)*c = 0
1/3*(c-6)-c/9 = 0
(1/3*9*(c-6))/9-c/9 = 0
1/3*9*(c-6)-c = 0
2*c-18 = 0
(2*c-18)/9 = 0
(2*c-18)/9 = 0 // * 9
2*c-18 = 0
2*c-18 = 0 // + 18
2*c = 18 // : 2
c = 18/2
c = 9
c = 9
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