7-d+5d=9

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Solution for 7-d+5d=9 equation: 



7-d+5d=9

We move all terms to the left:

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

We add all the numbers together, and all the variables

4d-2=0

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

4d=2

d=2/4

d=1/2

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