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6b-1-7b=b-9
We move all terms to the left:
6b-1-7b-(b-9)=0
We add all the numbers together, and all the variables
-1b-(b-9)-1=0
We get rid of parentheses
-1b-b+9-1=0
We add all the numbers together, and all the variables
-2b+8=0
We move all terms containing b to the left, all other terms to the right
-2b=-8
b=-8/-2
b=+4
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