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-9b=-8.1
We move all terms to the left:
-9b-(-8.1)=0
We add all the numbers together, and all the variables
-9b+8.1=0
We move all terms containing b to the left, all other terms to the right
-9b=-8.1
b=-8.1/-9
b=7.3636363636364/8.1818181818182
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