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X in (-oo:+oo)
X/3+X+3*X = 13/27 // - 13/27
X/3+X+3*X-(13/27) = 0
X/3+X+3*X-13/27 = 0
13/3*X-13/27 = 0 // + 13/27
13/3*X = 13/27 // : 13/3
X = 13/27/13/3
X = 1/9
X = 1/9
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