7=1+b+b

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Solution for 7=1+b+b equation: 



7=1+b+b

We move all terms to the left:

7-(1+b+b)=0

We add all the numbers together, and all the variables

-(2b+1)+7=0

We get rid of parentheses

-2b-1+7=0

We add all the numbers together, and all the variables

-2b+6=0

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

-2b=-6

b=-6/-2

b=+3

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