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X in (-oo:+oo)
(X-9)/7 = 9/14 // - 9/14
(X-9)/7-(9/14) = 0
(X-9)/7-9/14 = 0
(14*(X-9))/(7*14)+(-9*7)/(7*14) = 0
14*(X-9)-9*7 = 0
14*X-189 = 0
(14*X-189)/(7*14) = 0
(14*X-189)/(7*14) = 0 // * 7*14
14*X-189 = 0
14*X-189 = 0 // + 189
14*X = 189 // : 14
X = 189/14
X = 27/2
X = 27/2
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