7d+9=65

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Solution for 7d+9=65 equation: 


d in (-oo:+oo)

7*d+9 = 65 // - 65

7*d-65+9 = 0

7*d-56 = 0 // + 56

7*d = 56 // : 7

d = 56/7

d = 8

d = 8

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