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-7-5b=-7-4b-b
We move all terms to the left:
-7-5b-(-7-4b-b)=0
We add all the numbers together, and all the variables
-5b-(-5b-7)-7=0
We get rid of parentheses
-5b+5b+7-7=0
We add all the numbers together, and all the variables
=0
b=0/1
b=0
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