2(d+9)=20

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Solution for 2(d+9)=20 equation: 



2(d+9)=20

We move all terms to the left:

2(d+9)-(20)=0

We multiply parentheses

2d+18-20=0

We add all the numbers together, and all the variables

2d-2=0

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

2d=2

d=2/2

d=1

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