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x in (-oo:+oo)
1-((8/9)*x) = 8 // - 8
1-((8/9)*x)-8 = 0
(-8/9)*x-8+1 = 0
-8/9*x-7 = 0 // + 7
-8/9*x = 7 // : -8/9
x = 7/(-8/9)
x = -63/8
x = -63/8
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