3d-4+d=8d-9(-12)

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Solution for 3d-4+d=8d-9(-12) equation: 



3d-4+d=8d-9(-12)

We move all terms to the left:

3d-4+d-(8d-9(-12))=0

We add all the numbers together, and all the variables

4d-(8d-9(-12))-4=0



We calculate terms in parentheses: -(8d-9(-12)), so:

8d-9(-12)

We add all the numbers together, and all the variables

8d+108

Back to the equation:

-(8d+108)



We get rid of parentheses

4d-8d-108-4=0

We add all the numbers together, and all the variables

-4d-112=0

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

-4d=112

d=112/-4

d=-28

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