5
![5(3b - 3) - 3(3b - 7) = 12 5(3b - 3) - 3(3b - 7) = 12](https://tex.z-dn.net/?f=5%283b+-+3%29+-+3%283b+-+7%29+%3D+12)
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1
Answer:
Step-by-step explanation:
15b-15-9b+21=12
6b+6=12
6b=12-6
6b=6
b=6/6
b=1
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