12=18+d

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Solution for 12=18+d equation: 



12=18+d

We move all terms to the left:

12-(18+d)=0

We add all the numbers together, and all the variables

-(d+18)+12=0

We get rid of parentheses

-d-18+12=0

We add all the numbers together, and all the variables

-1d-6=0

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

-d=6

d=6/-1

d=-6

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