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77.5=15.5+b
We move all terms to the left:
77.5-(15.5+b)=0
We add all the numbers together, and all the variables
-(b+15.5)+77.5=0
We get rid of parentheses
-b-15.5+77.5=0
We add all the numbers together, and all the variables
-1b+62=0
We move all terms containing b to the left, all other terms to the right
-b=-62
b=-62/-1
b=+62
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