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3b+3b=-13-7b
We move all terms to the left:
3b+3b-(-13-7b)=0
We add all the numbers together, and all the variables
3b+3b-(-7b-13)=0
We add all the numbers together, and all the variables
6b-(-7b-13)=0
We get rid of parentheses
6b+7b+13=0
We add all the numbers together, and all the variables
13b+13=0
We move all terms containing b to the left, all other terms to the right
13b=-13
b=-13/13
b=-1
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