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x in (-oo:+oo)
X-(1/9)-1 = x-(9/10) // - x-(9/10)
X-x-(1/9)+9/10-1 = 0
X-x-1/9+9/10-1 = 0
X-x-19/90 = 0 // - X-19/90
-x = -(X-19/90) // * -1
x = X-19/90
x = X-19/90
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