-7d-9=-86

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Solution for -7d-9=-86 equation: 


d in (-oo:+oo)

-7*d-9 = -86 // + 86

86-7*d-9 = 0

77-7*d = 0 // - 77

-7*d = -77 // : -7

d = -77/(-7)

d = 11

d = 11

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