2(d+4)=21

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Solution for 2(d+4)=21 equation: 



2(d+4)=21

We move all terms to the left:

2(d+4)-(21)=0

We multiply parentheses

2d+8-21=0

We add all the numbers together, and all the variables

2d-13=0

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

2d=13

d=13/2

d=6+1/2

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