2d-9=0.5(d+12+12)

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Solution for 2d-9=0.5(d+12+12) equation: 



2d-9=0.5(d+12+12)

We move all terms to the left:

2d-9-(0.5(d+12+12))=0

We add all the numbers together, and all the variables

2d-(0.5(d+24))-9=0



We calculate terms in parentheses: -(0.5(d+24)), so:

0.5(d+24)

We multiply parentheses

0.5d+12

Back to the equation:

-(0.5d+12)



We get rid of parentheses

2d-0.5d-12-9=0

We add all the numbers together, and all the variables

1.5d-21=0

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

1.5d=21

d=21/1.5

d=14

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