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x in (-oo:+oo)
81 = (1/9)*x // - (1/9)*x
81-((1/9)*x) = 0
(-1/9)*x+81 = 0
81-1/9*x = 0 // - 81
-1/9*x = -81 // : -1/9
x = -81/(-1/9)
x = 729
x = 729
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