7d+7=84

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Solution for 7d+7=84 equation: 


d in (-oo:+oo)

7*d+7 = 84 // - 84

7*d-84+7 = 0

7*d-77 = 0 // + 77

7*d = 77 // : 7

d = 77/7

d = 11

d = 11

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