5/7d+1+7d=55 - solution

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Solution for 5/7d+1+7d=55 equation:

d in (-oo:+oo)

(5/7)*d+7*d+1 = 55 // - 55

(5/7)*d+7*d-55+1 = 0

54/7*d-54 = 0 // + 54

54/7*d = 54 // : 54/7

d = 54/54/7

d = 7

d = 7

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