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x in (-oo:+oo)
2*x-(4/8) = x-(5/5) // - x-(5/5)
2*x-x-(4/8)+5/5 = 0
2*x-x-1/2+5/5 = 0
x+1/2 = 0 // - 1/2
x = -1/2
x = -1/2
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