-21=d-7d+9

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Solution for -21=d-7d+9 equation: 


d in (-oo:+oo)

-21 = d-(7*d)+9 // - d-(7*d)+9

7*d-d-21-9 = 0

6*d-30 = 0 // + 30

6*d = 30 // : 6

d = 30/6

d = 5

d = 5

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