-6d-7+d=9-9d

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Solution for -6d-7+d=9-9d equation: 



-6d-7+d=9-9d

We move all terms to the left:

-6d-7+d-(9-9d)=0

We add all the numbers together, and all the variables

-6d+d-(-9d+9)-7=0

We add all the numbers together, and all the variables

-5d-(-9d+9)-7=0

We get rid of parentheses

-5d+9d-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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