7d+4=81

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Solution for 7d+4=81 equation: 


d in (-oo:+oo)

7*d+4 = 81 // - 81

7*d-81+4 = 0

7*d-77 = 0 // + 77

7*d = 77 // : 7

d = 77/7

d = 11

d = 11

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