-7=8+d

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Solution for -7=8+d equation: 



-7=8+d

We move all terms to the left:

-7-(8+d)=0

We add all the numbers together, and all the variables

-(d+8)-7=0

We get rid of parentheses

-d-8-7=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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