-21=d-7d-3

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Solution for -21=d-7d-3 equation: 


d in (-oo:+oo)

-21 = d-(7*d)-3 // - d-(7*d)-3

7*d-d-21+3 = 0

6*d-18 = 0 // + 18

6*d = 18 // : 6

d = 18/6

d = 3

d = 3

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