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X in (-oo:+oo)
X/4 = 3/7 // - 3/7
X/4-(3/7) = 0
X/4-3/7 = 0
1/4*X-3/7 = 0 // + 3/7
1/4*X = 3/7 // : 1/4
X = 3/7/1/4
X = 12/7
X = 12/7
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