d/21=18/63

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Solution for d/21=18/63 equation: 


d in (-oo:+oo)

d/21 = 18/63 // - 18/63

d/21-(18/63) = 0

d/21-2/7 = 0

1/21*d-2/7 = 0 // + 2/7

1/21*d = 2/7 // : 1/21

d = 2/7/1/21

d = 6

d = 6

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