7-2d=21

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Solution for 7-2d=21 equation: 


d in (-oo:+oo)

7-(2*d) = 21 // - 21

7-(2*d)-21 = 0

7-2*d-21 = 0

-2*d-14 = 0 // + 14

-2*d = 14 // : -2

d = 14/(-2)

d = -7

d = -7

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