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