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x in (-oo:+oo)
(x-7)/9 = x/6 // - x/6
(x-7)/9-(x/6) = 0
(x-7)/9-x/6 = 0
(6*(x-7))/(6*9)+(9*(-x))/(6*9) = 0
6*(x-7)+9*(-x) = 0
-3*x-42 = 0
(-3*x-42)/(6*9) = 0
(-3*x-42)/(6*9) = 0 // * 6*9
-3*x-42 = 0
-3*x-42 = 0 // + 42
-3*x = 42 // : -3
x = 42/(-3)
x = -14
x = -14
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