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-8.5b=-9.3b-12
We move all terms to the left:
-8.5b-(-9.3b-12)=0
We get rid of parentheses
-8.5b+9.3b+12=0
We add all the numbers together, and all the variables
0.8b+12=0
We move all terms containing b to the left, all other terms to the right
0.8b=-12
b=-12/0.8
b=-15
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