3d+1=7d-7

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


d in (-oo:+oo)

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

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

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

8-4*d = 0 // - 8

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

d = -8/(-4)

d = 2

d = 2

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