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28=8b+13b+35
We move all terms to the left:
28-(8b+13b+35)=0
We add all the numbers together, and all the variables
-(21b+35)+28=0
We get rid of parentheses
-21b-35+28=0
We add all the numbers together, and all the variables
-21b-7=0
We move all terms containing b to the left, all other terms to the right
-21b=7
b=7/-21
b=-1/3
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