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