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x in (-oo:+oo)
(1/2)*(x-4)*(x-4) = 8 // - 8
(1/2)*(x-4)*(x-4)-8 = 0
1/2*(x-4)^2-8 = 0
1/2*(x-4)^2-8 = 0
1/2*x^2-4*x = 0
1/2*x^2-4*x = 0
x*(1/2*x-4) = 0
1/2*x-4 = 0 // + 4
1/2*x = 4 // : 1/2
x = 4/1/2
x = 8
x*(x-8) = 0
x*(x-8) = 0
( x-8 )
x-8 = 0 // + 8
x = 8
( x )
x = 0
x in { 8, 0 }
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