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12b-3=4+5b
We move all terms to the left:
12b-3-(4+5b)=0
We add all the numbers together, and all the variables
12b-(5b+4)-3=0
We get rid of parentheses
12b-5b-4-3=0
We add all the numbers together, and all the variables
7b-7=0
We move all terms containing b to the left, all other terms to the right
7b=7
b=7/7
b=1
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