-15d+13=-8-12d

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Solution for -15d+13=-8-12d equation: 



-15d+13=-8-12d

We move all terms to the left:

-15d+13-(-8-12d)=0

We add all the numbers together, and all the variables

-15d-(-12d-8)+13=0

We get rid of parentheses

-15d+12d+8+13=0

We add all the numbers together, and all the variables

-3d+21=0

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

-3d=-21

d=-21/-3

d=+7

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