15=12-d

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Solution for 15=12-d equation: 



15=12-d

We move all terms to the left:

15-(12-d)=0

We add all the numbers together, and all the variables

-(-1d+12)+15=0

We get rid of parentheses

1d-12+15=0

We add all the numbers together, and all the variables

d+3=0

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

d=-3

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