-7d=-15-8d

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Solution for -7d=-15-8d equation: 



-7d=-15-8d

We move all terms to the left:

-7d-(-15-8d)=0

We add all the numbers together, and all the variables

-7d-(-8d-15)=0

We get rid of parentheses

-7d+8d+15=0

We add all the numbers together, and all the variables

d+15=0

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

d=-15

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