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