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x in (-oo:+oo)
-9*x-(9/(-9)) = -9 // + 9
9-9*x-(9/(-9)) = 0
1-9*x+9 = 0
10-9*x = 0 // - 10
-9*x = -10 // : -9
x = -10/(-9)
x = 10/9
x = 10/9
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