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-13+b-5+5b=-7b+7b
We move all terms to the left:
-13+b-5+5b-(-7b+7b)=0
We add all the numbers together, and all the variables
b+5b-13-5-0=0
We add all the numbers together, and all the variables
6b-18=0
We move all terms containing b to the left, all other terms to the right
6b=18
b=18/6
b=3
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