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X in (-oo:+oo)
X/8 = 21/14 // - 21/14
X/8-(21/14) = 0
X/8-3/2 = 0
1/8*X-3/2 = 0 // + 3/2
1/8*X = 3/2 // : 1/8
X = 3/2/1/8
X = 12
X = 12
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