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-31=b+-48
We move all terms to the left:
-31-(b+-48)=0
We add all the numbers together, and all the variables
-(b-48)-31=0
We get rid of parentheses
-b+48-31=0
We add all the numbers together, and all the variables
-1b+17=0
We move all terms containing b to the left, all other terms to the right
-b=-17
b=-17/-1
b=+17
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