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63+12b=7b-2
We move all terms to the left:
63+12b-(7b-2)=0
We get rid of parentheses
12b-7b+2+63=0
We add all the numbers together, and all the variables
5b+65=0
We move all terms containing b to the left, all other terms to the right
5b=-65
b=-65/5
b=-13
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