9=7d+12

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Solution for 9=7d+12 equation: 



9=7d+12

We move all terms to the left:

9-(7d+12)=0

We get rid of parentheses

-7d-12+9=0

We add all the numbers together, and all the variables

-7d-3=0

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

-7d=3

d=3/-7

d=-3/7

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