3=12-d

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Solution for 3=12-d equation: 



3=12-d

We move all terms to the left:

3-(12-d)=0

We add all the numbers together, and all the variables

-(-1d+12)+3=0

We get rid of parentheses

1d-12+3=0

We add all the numbers together, and all the variables

d-9=0

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

d=9

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