-2d-7=-31

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Solution for -2d-7=-31 equation: 


d in (-oo:+oo)

-2*d-7 = -31 // + 31

31-2*d-7 = 0

24-2*d = 0 // - 24

-2*d = -24 // : -2

d = -24/(-2)

d = 12

d = 12

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