2d+1+d=28

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Solution for 2d+1+d=28 equation: 


d in (-oo:+oo)

2*d+d+1 = 28 // - 28

2*d+d-28+1 = 0

3*d-27 = 0 // + 27

3*d = 27 // : 3

d = 27/3

d = 9

d = 9

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