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15(b-1)+2(3b+7)=6
We move all terms to the left:
15(b-1)+2(3b+7)-(6)=0
We multiply parentheses
15b+6b-15+14-6=0
We add all the numbers together, and all the variables
21b-7=0
We move all terms containing b to the left, all other terms to the right
21b=7
b=7/21
b=1/3
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