7d=9+10d

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Solution for 7d=9+10d equation: 



7d=9+10d

We move all terms to the left:

7d-(9+10d)=0

We add all the numbers together, and all the variables

7d-(10d+9)=0

We get rid of parentheses

7d-10d-9=0

We add all the numbers together, and all the variables

-3d-9=0

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

-3d=9

d=9/-3

d=-3

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