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