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28=3+5b
We move all terms to the left:
28-(3+5b)=0
We add all the numbers together, and all the variables
-(5b+3)+28=0
We get rid of parentheses
-5b-3+28=0
We add all the numbers together, and all the variables
-5b+25=0
We move all terms containing b to the left, all other terms to the right
-5b=-25
b=-25/-5
b=+5
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