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X in (-oo:+oo)
X/15 = 5/8 // - 5/8
X/15-(5/8) = 0
X/15-5/8 = 0
1/15*X-5/8 = 0 // + 5/8
1/15*X = 5/8 // : 1/15
X = 5/8/1/15
X = 75/8
X = 75/8
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