9=d/21

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Solution for 9=d/21 equation: 


d in (-oo:+oo)

9 = d/21 // - d/21

9-(d/21) = 0

9-1/21*d = 0 // - 9

-1/21*d = -9 // : -1/21

d = -9/(-1/21)

d = 189

d = 189

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