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X in (-oo:+oo)
X/19 = 15/57 // - 15/57
X/19-(15/57) = 0
X/19-5/19 = 0
1/19*X-5/19 = 0 // + 5/19
1/19*X = 5/19 // : 1/19
X = 5/19/1/19
X = 5
X = 5
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