7+9d=7d+3d=-2

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Solution for 7+9d=7d+3d=-2 equation: 



7+9d=7d+3d=-2

We move all terms to the left:

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

We add all the numbers together, and all the variables

9d-(+10d)+7=0

We get rid of parentheses

9d-10d+7=0

We add all the numbers together, and all the variables

-1d+7=0

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

-d=-7

d=-7/-1

d=+7

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