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47=15+b
We move all terms to the left:
47-(15+b)=0
We add all the numbers together, and all the variables
-(b+15)+47=0
We get rid of parentheses
-b-15+47=0
We add all the numbers together, and all the variables
-1b+32=0
We move all terms containing b to the left, all other terms to the right
-b=-32
b=-32/-1
b=+32
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