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48=-48-2b+4b-12
We move all terms to the left:
48-(-48-2b+4b-12)=0
We add all the numbers together, and all the variables
-(2b-60)+48=0
We get rid of parentheses
-2b+60+48=0
We add all the numbers together, and all the variables
-2b+108=0
We move all terms containing b to the left, all other terms to the right
-2b=-108
b=-108/-2
b=+54
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