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3b-47+2b-26+2b-13=180
We move all terms to the left:
3b-47+2b-26+2b-13-(180)=0
We add all the numbers together, and all the variables
7b-266=0
We move all terms containing b to the left, all other terms to the right
7b=266
b=266/7
b=38
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