-2d+9+7d=-1

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Solution for -2d+9+7d=-1 equation: 


d in (-oo:+oo)

7*d-2*d+9 = -1 // + 1

7*d-2*d+1+9 = 0

5*d+10 = 0 // - 10

5*d = -10 // : 5

d = -10/5

d = -2

d = -2

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