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19b=4b+45
We move all terms to the left:
19b-(4b+45)=0
We get rid of parentheses
19b-4b-45=0
We add all the numbers together, and all the variables
15b-45=0
We move all terms containing b to the left, all other terms to the right
15b=45
b=45/15
b=3
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