7d+9=51

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Solution for 7d+9=51 equation: 


d in (-oo:+oo)

7*d+9 = 51 // - 51

7*d-51+9 = 0

7*d-42 = 0 // + 42

7*d = 42 // : 7

d = 42/7

d = 6

d = 6

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