-7d+7+4d=-20

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Solution for -7d+7+4d=-20 equation: 


d in (-oo:+oo)

4*d-7*d+7 = -20 // + 20

4*d-7*d+7+20 = 0

27-3*d = 0 // - 27

-3*d = -27 // : -3

d = -27/(-3)

d = 9

d = 9

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