7d+7=91

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Solution for 7d+7=91 equation: 


d in (-oo:+oo)

7*d+7 = 91 // - 91

7*d-91+7 = 0

7*d-84 = 0 // + 84

7*d = 84 // : 7

d = 84/7

d = 12

d = 12

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