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x in (-oo:+oo)
(1/4)*(4*x-4) = x-(4/8) // - x-(4/8)
(1/4)*(4*x-4)-x+4/8 = 0
1/4*(4*x-4)-x+1/2 = 0
(1/4*2*(4*x-4))/2+(2*(-x))/2+1/2 = 0
1/4*2*(4*x-4)+2*(-x)+1 = 0
1-2 = 0
-1 = 0
-1/2 = 0
-1/2 = 0 // * 2
-1 = 0
x belongs to the empty set
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