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X in (-oo:+oo)
X/15 = (3/4)/5 // - (3/4)/5
X/15-((3/4)/5) = 0
X/15-3/20 = 0
1/15*X-3/20 = 0 // + 3/20
1/15*X = 3/20 // : 1/15
X = 3/20/1/15
X = 9/4
X = 9/4
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