1-4d+2d=-1

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Solution for 1-4d+2d=-1 equation: 


d in (-oo:+oo)

2*d-(4*d)+1 = -1 // + 1

2*d-(4*d)+1+1 = 0

2*d-4*d+1+1 = 0

2-2*d = 0 // - 2

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

d = -2/(-2)

d = 1

d = 1

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