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63=7+28b
We move all terms to the left:
63-(7+28b)=0
We add all the numbers together, and all the variables
-(28b+7)+63=0
We get rid of parentheses
-28b-7+63=0
We add all the numbers together, and all the variables
-28b+56=0
We move all terms containing b to the left, all other terms to the right
-28b=-56
b=-56/-28
b=+2
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