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6b-63=4b-31
We move all terms to the left:
6b-63-(4b-31)=0
We get rid of parentheses
6b-4b+31-63=0
We add all the numbers together, and all the variables
2b-32=0
We move all terms containing b to the left, all other terms to the right
2b=32
b=32/2
b=16
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