2+5d+2d=30

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Solution for 2+5d+2d=30 equation: 


d in (-oo:+oo)

5*d+2*d+2 = 30 // - 30

5*d+2*d-30+2 = 0

7*d-28 = 0 // + 28

7*d = 28 // : 7

d = 28/7

d = 4

d = 4

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