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71=-b+19
We move all terms to the left:
71-(-b+19)=0
We add all the numbers together, and all the variables
-(-1b+19)+71=0
We get rid of parentheses
1b-19+71=0
We add all the numbers together, and all the variables
b+52=0
We move all terms containing b to the left, all other terms to the right
b=-52
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