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28=4b+8
We move all terms to the left:
28-(4b+8)=0
We get rid of parentheses
-4b-8+28=0
We add all the numbers together, and all the variables
-4b+20=0
We move all terms containing b to the left, all other terms to the right
-4b=-20
b=-20/-4
b=+5
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