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