3D+18=30-4d

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Solution for 3D+18=30-4d equation: 



3+18=30-4D

We move all terms to the left:

3+18-(30-4D)=0

We add all the numbers together, and all the variables

-(-4D+30)+3+18=0

We add all the numbers together, and all the variables

-(-4D+30)+21=0

We get rid of parentheses

4D-30+21=0

We add all the numbers together, and all the variables

4D-9=0

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

4D=9

D=9/4

D=2+1/4

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