7d+1+d=-1

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


d in (-oo:+oo)

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

7*d+d+1+1 = 0

8*d+2 = 0 // - 2

8*d = -2 // : 8

d = -2/8

d = -1/4

d = -1/4

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