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80=-1.09(19)+b
We move all terms to the left:
80-(-1.09(19)+b)=0
We add all the numbers together, and all the variables
-(b-1.0919)+80=0
We get rid of parentheses
-b+1.0919+80=0
We add all the numbers together, and all the variables
-1b+81.0919=0
We move all terms containing b to the left, all other terms to the right
-b=-81.0919
b=-81.0919/-1
b=81+0.0919/1
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