12=-3+d

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Solution for 12=-3+d equation: 



12=-3+d

We move all terms to the left:

12-(-3+d)=0

We add all the numbers together, and all the variables

-(d-3)+12=0

We get rid of parentheses

-d+3+12=0

We add all the numbers together, and all the variables

-1d+15=0

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

-d=-15

d=-15/-1

d=+15

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