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X in (-oo:+oo)
X/6-(1/5) = 7/30 // - 7/30
X/6-(1/5)-(7/30) = 0
X/6-1/5-7/30 = 0
1/6*X-13/30 = 0 // + 13/30
1/6*X = 13/30 // : 1/6
X = 13/30/1/6
X = 13/5
X = 13/5
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