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19=12+b
We move all terms to the left:
19-(12+b)=0
We add all the numbers together, and all the variables
-(b+12)+19=0
We get rid of parentheses
-b-12+19=0
We add all the numbers together, and all the variables
-1b+7=0
We move all terms containing b to the left, all other terms to the right
-b=-7
b=-7/-1
b=+7
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