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