-1+2d=-7

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


d in (-oo:+oo)

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

2*d-1+7 = 0

2*d+6 = 0 // - 6

2*d = -6 // : 2

d = -6/2

d = -3

d = -3

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