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