7/10=d+4/2d

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Solution for 7/10=d+4/2d equation: 


d in (-oo:+oo)

7/10 = d+(4/2)*d // - d+(4/2)*d

7/10-d-((4/2)*d) = 0

7/10-d-2*d = 0

7/10-3*d = 0 // - 7/10

-3*d = -7/10 // : -3

d = -7/10/(-3)

d = 7/30

d = 7/30

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