2d+6=-7d+42

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Solution for 2d+6=-7d+42 equation: 


d in (-oo:+oo)

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

2*d-(-7*d)-42+6 = 0

2*d+7*d-42+6 = 0

9*d-36 = 0 // + 36

9*d = 36 // : 9

d = 36/9

d = 4

d = 4

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