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13b=b+63
We move all terms to the left:
13b-(b+63)=0
We get rid of parentheses
13b-b-63=0
We add all the numbers together, and all the variables
12b-63=0
We move all terms containing b to the left, all other terms to the right
12b=63
b=63/12
b=5+1/4
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