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X in (-oo:+oo)
X/15 = 21/24 // - 21/24
X/15-(21/24) = 0
X/15-7/8 = 0
1/15*X-7/8 = 0 // + 7/8
1/15*X = 7/8 // : 1/15
X = 7/8/1/15
X = 105/8
X = 105/8
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