-d-d=4

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Solution for -d-d=4 equation: 



-d-d=4

We move all terms to the left:

-d-d-(4)=0

We add all the numbers together, and all the variables

-2d-4=0

We move all terms containing d to the left, all other terms to the right

-2d=4

d=4/-2

d=-2

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