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13b+74=3b+84
We move all terms to the left:
13b+74-(3b+84)=0
We get rid of parentheses
13b-3b-84+74=0
We add all the numbers together, and all the variables
10b-10=0
We move all terms containing b to the left, all other terms to the right
10b=10
b=10/10
b=1
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