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x in (-oo:+oo)
1-((2/3)*x) = 9 // - 9
1-((2/3)*x)-9 = 0
(-2/3)*x-9+1 = 0
-2/3*x-8 = 0 // + 8
-2/3*x = 8 // : -2/3
x = 8/(-2/3)
x = -12
x = -12
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