2(d+1)=-20

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Solution for 2(d+1)=-20 equation: 



2(d+1)=-20

We move all terms to the left:

2(d+1)-(-20)=0

We add all the numbers together, and all the variables

2(d+1)+20=0

We multiply parentheses

2d+2+20=0

We add all the numbers together, and all the variables

2d+22=0

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

2d=-22

d=-22/2

d=-11

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