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-7b+4b=1+2b-4b
We move all terms to the left:
-7b+4b-(1+2b-4b)=0
We add all the numbers together, and all the variables
-7b+4b-(-2b+1)=0
We add all the numbers together, and all the variables
-3b-(-2b+1)=0
We get rid of parentheses
-3b+2b-1=0
We add all the numbers together, and all the variables
-1b-1=0
We move all terms containing b to the left, all other terms to the right
-b=1
b=1/-1
b=-1
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