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X in (-oo:+oo)
X/15 = 12/20 // - 12/20
X/15-(12/20) = 0
X/15-3/5 = 0
1/15*X-3/5 = 0 // + 3/5
1/15*X = 3/5 // : 1/15
X = 3/5/1/15
X = 9
X = 9
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