7d+18=81

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Solution for 7d+18=81 equation: 



7d+18=81

We move all terms to the left:

7d+18-(81)=0

We add all the numbers together, and all the variables

7d-63=0

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

7d=63

d=63/7

d=9

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