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X in (-oo:+oo)
(X+1)/5 = 1-((X+1)/9) // - 1-((X+1)/9)
(X+1)/5+(X+1)/9-1 = 0
(9*(X+1))/(5*9)+(5*(X+1))/(5*9)+(-1*5*9)/(5*9) = 0
9*(X+1)+5*(X+1)-1*5*9 = 0
14*X-45+14 = 0
14*X-31 = 0
(14*X-31)/(5*9) = 0
(14*X-31)/(5*9) = 0 // * 5*9
14*X-31 = 0
14*X-31 = 0 // + 31
14*X = 31 // : 14
X = 31/14
X = 31/14
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