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X in (-oo:+oo)
(X-9)/5 = (X-7)/6 // - (X-7)/6
(X-9)/5-((X-7)/6) = 0
(X-9)/5+(-1*(X-7))/6 = 0
(6*(X-9))/(5*6)+(-1*5*(X-7))/(5*6) = 0
6*(X-9)-1*5*(X-7) = 0
X-19 = 0
(X-19)/(5*6) = 0
(X-19)/(5*6) = 0 // * 5*6
X-19 = 0
X-19 = 0 // + 19
X = 19
X = 19
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