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x in (-oo:+oo)
((x-5)/8)*(8*x+5) = 0
((x-5)*(8*x+5))/8 = 0
( 8*x+5 )
8*x+5 = 0 // - 5
8*x = -5 // : 8
x = -5/8
( x-5 )
x-5 = 0 // + 5
x = 5
x in { -5/8, 5 }
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