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x in (-oo:+oo)
2*x-(5/2) = x/2 // - x/2
2*x-(x/2)-(5/2) = 0
2*x-(x/2)-5/2 = 0
3/2*x-5/2 = 0 // + 5/2
3/2*x = 5/2 // : 3/2
x = 5/2/3/2
x = 5/3
x = 5/3
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