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(b+2.8)+83=3
We move all terms to the left:
(b+2.8)+83-(3)=0
We add all the numbers together, and all the variables
(b+2.8)+80=0
We get rid of parentheses
b+2.8+80=0
We add all the numbers together, and all the variables
b+82.8=0
We move all terms containing b to the left, all other terms to the right
b=-82.8
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