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X in (-oo:+oo)
(1*X)/3 = 0.123456789 // - 0.123456789
(1*X)/3-0.123456789 = 0
X/3-0.123456789 = 0
1/3*X-0.123456789 = 0 // + 0.123456789
1/3*X = 0.123456789 // : 1/3
X = 0.123456789/1/3
X = 0.37037037
X = 0.37037037
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