1+7d=78

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Solution for 1+7d=78 equation: 


d in (-oo:+oo)

7*d+1 = 78 // - 78

7*d-78+1 = 0

7*d-77 = 0 // + 77

7*d = 77 // : 7

d = 77/7

d = 11

d = 11

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