8d+9=81

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Solution for 8d+9=81 equation: 



8d+9=81

We move all terms to the left:

8d+9-(81)=0

We add all the numbers together, and all the variables

8d-72=0

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

8d=72

d=72/8

d=9

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