(d/640)(d+20/160)

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Solution for (d/640)(d+20/160) equation: 


d in (-oo:+oo)

(d/640)*(d+20/160) = 0

1/640*d*(d+1/8) = 0

( 1/640*d )

1/640*d = 0 // : 1/640

d = 0

( d+1/8 )

d+1/8 = 0 // - 1/8

d = -1/8

d in { 0, -1/8 }

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