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45=8b-3
We move all terms to the left:
45-(8b-3)=0
We get rid of parentheses
-8b+3+45=0
We add all the numbers together, and all the variables
-8b+48=0
We move all terms containing b to the left, all other terms to the right
-8b=-48
b=-48/-8
b=+6
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