7d-7d+d=9

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



7d-7d+d=9

We move all terms to the left:

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

We add all the numbers together, and all the variables

d-9=0

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

d=9

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