3d=20-d

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Solution for 3d=20-d equation: 



3d=20-d

We move all terms to the left:

3d-(20-d)=0

We add all the numbers together, and all the variables

3d-(-1d+20)=0

We get rid of parentheses

3d+1d-20=0

We add all the numbers together, and all the variables

4d-20=0

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

4d=20

d=20/4

d=5

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