9+7d=79

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Solution for 9+7d=79 equation: 


d in (-oo:+oo)

7*d+9 = 79 // - 79

7*d-79+9 = 0

7*d-70 = 0 // + 70

7*d = 70 // : 7

d = 70/7

d = 10

d = 10

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