381=d-40

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Solution for 381=d-40 equation: 



381=d-40

We move all terms to the left:

381-(d-40)=0

We get rid of parentheses

-d+40+381=0

We add all the numbers together, and all the variables

-1d+421=0

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

-d=-421

d=-421/-1

d=+421

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