81=-6d+9

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Solution for 81=-6d+9 equation: 



81=-6d+9

We move all terms to the left:

81-(-6d+9)=0

We get rid of parentheses

6d-9+81=0

We add all the numbers together, and all the variables

6d+72=0

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

6d=-72

d=-72/6

d=-12

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