2(d+2)=20

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Solution for 2(d+2)=20 equation: 



2(d+2)=20

We move all terms to the left:

2(d+2)-(20)=0

We multiply parentheses

2d+4-20=0

We add all the numbers together, and all the variables

2d-16=0

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

2d=16

d=16/2

d=8

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