8d-21=4d+19

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Solution for 8d-21=4d+19 equation: 



8d-21=4d+19

We move all terms to the left:

8d-21-(4d+19)=0

We get rid of parentheses

8d-4d-19-21=0

We add all the numbers together, and all the variables

4d-40=0

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

4d=40

d=40/4

d=10

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