3+7d=31

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Solution for 3+7d=31 equation: 


d in (-oo:+oo)

7*d+3 = 31 // - 31

7*d-31+3 = 0

7*d-28 = 0 // + 28

7*d = 28 // : 7

d = 28/7

d = 4

d = 4

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