d2=9/49

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Solution for d2=9/49 equation: 


d in (-oo:+oo)

d^2 = 9/49 // - 9/49

d^2-(9/49) = 0

d^2-9/49 = 0

1*d^2 = 9/49 // : 1

d^2 = 9/49

d^2 = 9/49 // ^ 1/2

abs(d) = 3/7

d = 3/7 or d = -3/7

d in { 3/7, -3/7 }

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