.4d=-21-d

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Solution for .4d=-21-d equation: 



.4d=-21-d

We move all terms to the left:

.4d-(-21-d)=0

We add all the numbers together, and all the variables

.4d-(-1d-21)=0

We get rid of parentheses

.4d+1d+21=0

We add all the numbers together, and all the variables

1.4d+21=0

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

1.4d=-21

d=-21/1.4

d=-15

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