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48=12+b
We move all terms to the left:
48-(12+b)=0
We add all the numbers together, and all the variables
-(b+12)+48=0
We get rid of parentheses
-b-12+48=0
We add all the numbers together, and all the variables
-1b+36=0
We move all terms containing b to the left, all other terms to the right
-b=-36
b=-36/-1
b=+36
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