7=2(d+1)-1

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Solution for 7=2(d+1)-1 equation: 



7=2(d+1)-1

We move all terms to the left:

7-(2(d+1)-1)=0



We calculate terms in parentheses: -(2(d+1)-1), so:

2(d+1)-1

We multiply parentheses

2d+2-1

We add all the numbers together, and all the variables

2d+1

Back to the equation:

-(2d+1)



We get rid of parentheses

-2d-1+7=0

We add all the numbers together, and all the variables

-2d+6=0

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

-2d=-6

d=-6/-2

d=+3

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