D=(d-2)*(9+3)+(4)

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Solution for D=(d-2)*(9+3)+(4) equation: 



=(D-2)(9+3)+(4)

We move all terms to the left:

-((D-2)(9+3)+(4))=0

We add all the numbers together, and all the variables

-((D-2)12+4)=0



We calculate terms in parentheses: -((D-2)12+4), so:

(D-2)12+4

We multiply parentheses

12D-24+4

We add all the numbers together, and all the variables

12D-20

Back to the equation:

-(12D-20)



We get rid of parentheses

-12D+20=0

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

-12D=-20

D=-20/-12

D=1+2/3

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