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x in (-oo:+oo)
1/9-(2*x) = 10/9 // - 10/9
1/9-(2*x)-(10/9) = 0
1/9-2*x-10/9 = 0
-2*x-1 = 0 // + 1
-2*x = 1 // : -2
x = 1/(-2)
x = -1/2
x = -1/2
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