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x in (-oo:+oo)
-9*x-(9/9) = -9 // + 9
9-9*x-(9/9) = 0
9-9*x-1 = 0
8-9*x = 0 // - 8
-9*x = -8 // : -9
x = -8/(-9)
x = 8/9
x = 8/9
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