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