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2b+2b+3+2b+2b+3=216
We move all terms to the left:
2b+2b+3+2b+2b+3-(216)=0
We add all the numbers together, and all the variables
8b-210=0
We move all terms containing b to the left, all other terms to the right
8b=210
b=210/8
b=26+1/4
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