1-3d-7d=-4

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Solution for 1-3d-7d=-4 equation: 


d in (-oo:+oo)

1-(3*d)-(7*d) = -4 // + 4

1-(3*d)-(7*d)+4 = 0

1-3*d-7*d+4 = 0

5-10*d = 0 // - 5

-10*d = -5 // : -10

d = -5/(-10)

d = 1/2

d = 1/2

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