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28=8b+13b-4
We move all terms to the left:
28-(8b+13b-4)=0
We add all the numbers together, and all the variables
-(21b-4)+28=0
We get rid of parentheses
-21b+4+28=0
We add all the numbers together, and all the variables
-21b+32=0
We move all terms containing b to the left, all other terms to the right
-21b=-32
b=-32/-21
b=1+11/21
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