-d+1+4/5d=9/10

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Solution for -d+1+4/5d=9/10 equation: 


d in (-oo:+oo)

(4/5)*d-d+1 = 9/10 // - 9/10

(4/5)*d-d-(9/10)+1 = 0

(4/5)*d-d-9/10+1 = 0

1/10-1/5*d = 0 // - 1/10

-1/5*d = -1/10 // : -1/5

d = -1/10/(-1/5)

d = 1/2

d = 1/2

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