7d-7=-91

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Solution for 7d-7=-91 equation: 


d in (-oo:+oo)

7*d-7 = -91 // + 91

7*d-7+91 = 0

7*d+84 = 0 // - 84

7*d = -84 // : 7

d = -84/7

d = -12

d = -12

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