7d-13=78

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Solution for 7d-13=78 equation: 



7d-13=78

We move all terms to the left:

7d-13-(78)=0

We add all the numbers together, and all the variables

7d-91=0

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

7d=91

d=91/7

d=13

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