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5(4b+13)=255
We move all terms to the left:
5(4b+13)-(255)=0
We multiply parentheses
20b+65-255=0
We add all the numbers together, and all the variables
20b-190=0
We move all terms containing b to the left, all other terms to the right
20b=190
b=190/20
b=9+1/2
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