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X in (-oo:+oo)
X/15 = 4/5 // - 4/5
X/15-(4/5) = 0
X/15-4/5 = 0
1/15*X-4/5 = 0 // + 4/5
1/15*X = 4/5 // : 1/15
X = 4/5/1/15
X = 12
X = 12
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