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X in (-oo:+oo)
2*X = 14/30 // - 14/30
2*X-(14/30) = 0
2*X-7/15 = 0
2*X-7/15 = 0 // + 7/15
2*X = 7/15 // : 2
X = 7/15/2
X = 7/30
X = 7/30
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