7d+1=31+4d

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Solution for 7d+1=31+4d equation: 


d in (-oo:+oo)

7*d+1 = 4*d+31 // - 4*d+31

7*d-(4*d)-31+1 = 0

7*d-4*d-31+1 = 0

3*d-30 = 0 // + 30

3*d = 30 // : 3

d = 30/3

d = 10

d = 10

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