D=4-2x

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Solution for D=4-2x equation: 



=4-2D

We move all terms to the left:

-(4-2D)=0

We add all the numbers together, and all the variables

-(-2D+4)=0

We get rid of parentheses

2D-4=0

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

2D=4

D=4/2

D=2

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