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X in (-oo:+oo)
2*X = (1/2)*X+15/2 // - (1/2)*X+15/2
2*X-((1/2)*X)-(15/2) = 0
2*X+(-1/2)*X-15/2 = 0
3/2*X-15/2 = 0 // + 15/2
3/2*X = 15/2 // : 3/2
X = 15/2/3/2
X = 5
X = 5
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