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c in (-oo:+oo)
(3*c)/9 = 4-c // - 4-c
(3*c)/9+c-4 = 0
4/3*c-4 = 0 // + 4
4/3*c = 4 // : 4/3
c = 4/4/3
c = 3
c = 3
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