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X in (-oo:+oo)
(2*X)/5 = 3/2 // - 3/2
(2*X)/5-(3/2) = 0
(2*X)/5-3/2 = 0
2/5*X-3/2 = 0 // + 3/2
2/5*X = 3/2 // : 2/5
X = 3/2/2/5
X = 15/4
X = 15/4
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