4=8-7d

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Solution for 4=8-7d equation: 



4=8-7d

We move all terms to the left:

4-(8-7d)=0

We add all the numbers together, and all the variables

-(-7d+8)+4=0

We get rid of parentheses

7d-8+4=0

We add all the numbers together, and all the variables

7d-4=0

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

7d=4

d=4/7

d=4/7

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