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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-222=0
We move all terms containing b to the left, all other terms to the right
8b=222
b=222/8
b=27+3/4
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