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X in (-oo:+oo)
X/(2/3) = 21/16 // - 21/16
X/(2/3)-(21/16) = 0
X/(2/3)-21/16 = 0
3/2*X-21/16 = 0 // + 21/16
3/2*X = 21/16 // : 3/2
X = 21/16/3/2
X = 7/8
X = 7/8
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