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-4+1b+6b=9+8+4b
We move all terms to the left:
-4+1b+6b-(9+8+4b)=0
We add all the numbers together, and all the variables
1b+6b-(4b+17)-4=0
We add all the numbers together, and all the variables
7b-(4b+17)-4=0
We get rid of parentheses
7b-4b-17-4=0
We add all the numbers together, and all the variables
3b-21=0
We move all terms containing b to the left, all other terms to the right
3b=21
b=21/3
b=7
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