7-d+6d=42

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Solution for 7-d+6d=42 equation: 


d in (-oo:+oo)

6*d-d+7 = 42 // - 42

6*d-d-42+7 = 0

5*d-35 = 0 // + 35

5*d = 35 // : 5

d = 35/5

d = 7

d = 7

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