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X in (-oo:+oo)
X/2+3/2 = 4/5 // - 4/5
X/2+3/2-(4/5) = 0
X/2+3/2-4/5 = 0
1/2*X+7/10 = 0 // - 7/10
1/2*X = -7/10 // : 1/2
X = -7/10/1/2
X = -7/5
X = -7/5
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