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-2.5b=20.5
We move all terms to the left:
-2.5b-(20.5)=0
We add all the numbers together, and all the variables
-2.5b-20.5=0
We move all terms containing b to the left, all other terms to the right
-2.5b=20.5
b=20.5/-2.5
b=-8+0.5/2.5
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