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-31=5-4b
We move all terms to the left:
-31-(5-4b)=0
We add all the numbers together, and all the variables
-(-4b+5)-31=0
We get rid of parentheses
4b-5-31=0
We add all the numbers together, and all the variables
4b-36=0
We move all terms containing b to the left, all other terms to the right
4b=36
b=36/4
b=9
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