-13=15+d

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Solution for -13=15+d equation: 



-13=15+d

We move all terms to the left:

-13-(15+d)=0

We add all the numbers together, and all the variables

-(d+15)-13=0

We get rid of parentheses

-d-15-13=0

We add all the numbers together, and all the variables

-1d-28=0

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

-d=28

d=28/-1

d=-28

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