7/63=1/d

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Solution for 7/63=1/d equation: 


D( d )

d = 0

d = 0

d = 0

d in (-oo:0) U (0:+oo)

7/63 = 1/d // - 1/d

7/63-(1/d) = 0

7/63-d^-1 = 0

-1*d^-1 = -1/9 // : -1

d^-1 = 1/9

-1 < 0

1/(d^1) = 1/9 // * d^1

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

9 = d^1

d = 9

d = 9

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