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x in (-oo:+oo)
x/3 = 3/999 // - 3/999
x/3-(3/999) = 0
x/3-1/333 = 0
1/3*x-1/333 = 0 // + 1/333
1/3*x = 1/333 // : 1/3
x = 1/333/1/3
x = 1/111
x = 1/111
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