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71=1-7b
We move all terms to the left:
71-(1-7b)=0
We add all the numbers together, and all the variables
-(-7b+1)+71=0
We get rid of parentheses
7b-1+71=0
We add all the numbers together, and all the variables
7b+70=0
We move all terms containing b to the left, all other terms to the right
7b=-70
b=-70/7
b=-10
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