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4(5+2b)=28
We move all terms to the left:
4(5+2b)-(28)=0
We add all the numbers together, and all the variables
4(2b+5)-28=0
We multiply parentheses
8b+20-28=0
We add all the numbers together, and all the variables
8b-8=0
We move all terms containing b to the left, all other terms to the right
8b=8
b=8/8
b=1
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