1=3d+d-7

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


d in (-oo:+oo)

1 = 3*d+d-7 // - 3*d+d-7

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

1-3*d-d+7 = 0

8-4*d = 0 // - 8

-4*d = -8 // : -4

d = -8/(-4)

d = 2

d = 2

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