9d-18=81

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Solution for 9d-18=81 equation: 



9d-18=81

We move all terms to the left:

9d-18-(81)=0

We add all the numbers together, and all the variables

9d-99=0

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

9d=99

d=99/9

d=11

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