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X in (-oo:+oo)
X/28 = 4/14 // - 4/14
X/28-(4/14) = 0
X/28-2/7 = 0
1/28*X-2/7 = 0 // + 2/7
1/28*X = 2/7 // : 1/28
X = 2/7/1/28
X = 8
X = 8
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