7d+6=13

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Solution for 7d+6=13 equation: 


d in (-oo:+oo)

7*d+6 = 13 // - 13

7*d-13+6 = 0

7*d-7 = 0 // + 7

7*d = 7 // : 7

d = 7/7

d = 1

d = 1

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