-7-7d=-21

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Solution for -7-7d=-21 equation: 


d in (-oo:+oo)

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

21-(7*d)-7 = 0

21-7*d-7 = 0

14-7*d = 0 // - 14

-7*d = -14 // : -7

d = -14/(-7)

d = 2

d = 2

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