7d+25=81

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Solution for 7d+25=81 equation: 



7d+25=81

We move all terms to the left:

7d+25-(81)=0

We add all the numbers together, and all the variables

7d-56=0

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

7d=56

d=56/7

d=8

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