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12b+19=17b+54
We move all terms to the left:
12b+19-(17b+54)=0
We get rid of parentheses
12b-17b-54+19=0
We add all the numbers together, and all the variables
-5b-35=0
We move all terms containing b to the left, all other terms to the right
-5b=35
b=35/-5
b=-7
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