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2.5=b-6.5
We move all terms to the left:
2.5-(b-6.5)=0
We get rid of parentheses
-b+6.5+2.5=0
We add all the numbers together, and all the variables
-1b+9=0
We move all terms containing b to the left, all other terms to the right
-b=-9
b=-9/-1
b=+9
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