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5=-4+2b+7
We move all terms to the left:
5-(-4+2b+7)=0
We add all the numbers together, and all the variables
-(2b+3)+5=0
We get rid of parentheses
-2b-3+5=0
We add all the numbers together, and all the variables
-2b+2=0
We move all terms containing b to the left, all other terms to the right
-2b=-2
b=-2/-2
b=1
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