4d+7+3d=28

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Solution for 4d+7+3d=28 equation: 


d in (-oo:+oo)

4*d+3*d+7 = 28 // - 28

4*d+3*d-28+7 = 0

7*d-21 = 0 // + 21

7*d = 21 // : 7

d = 21/7

d = 3

d = 3

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