-d-7=3d+9

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Solution for -d-7=3d+9 equation: 



-d-7=3d+9

We move all terms to the left:

-d-7-(3d+9)=0

We add all the numbers together, and all the variables

-1d-(3d+9)-7=0

We get rid of parentheses

-1d-3d-9-7=0

We add all the numbers together, and all the variables

-4d-16=0

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

-4d=16

d=16/-4

d=-4

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