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x in (-oo:+oo)
(x-9)/9-((x-7)/7) = 0
(x-9)/9+(-1*(x-7))/7 = 0
(7*(x-9))/(7*9)+(-1*9*(x-7))/(7*9) = 0
7*(x-9)-1*9*(x-7) = 0
-2*x = 0
(-2*x)/(7*9) = 0
(-2*x)/(7*9) = 0 // * 7*9
-2*x = 0
-2*x = 0 // : -2
x = 0
x = 0
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