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c in (-oo:+oo)
(c+2)/9 = 18/27 // - 18/27
(c+2)/9-(18/27) = 0
(c+2)/9-2/3 = 0
(3*(c+2))/(3*9)+(-2*9)/(3*9) = 0
3*(c+2)-2*9 = 0
3*c-12 = 0
(3*c-12)/(3*9) = 0
(3*c-12)/(3*9) = 0 // * 3*9
3*c-12 = 0
3*c-12 = 0 // + 12
3*c = 12 // : 3
c = 12/3
c = 4
c = 4
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