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