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x in (-oo:+oo)
x+x+1/2 = 5/2 // - 5/2
x+x+1/2-(5/2) = 0
x+x+1/2-5/2 = 0
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
x = 1
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