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n in (-oo:+oo)
5/6 = (7*n+9)/9 // - (7*n+9)/9
5/6-((7*n+9)/9) = 0
(-1*(7*n+9))/9+5/6 = 0
(-1*6*(7*n+9))/(6*9)+(5*9)/(6*9) = 0
5*9-1*6*(7*n+9) = 0
-42*n-9 = 0
(-42*n-9)/(6*9) = 0
(-42*n-9)/(6*9) = 0 // * 6*9
-42*n-9 = 0
-42*n-9 = 0 // + 9
-42*n = 9 // : -42
n = 9/(-42)
n = -3/14
n = -3/14
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