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