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269.64=9(0.08m+20.90-0.20(20.90)
We move all terms to the left:
269.64-(9(0.08m+20.90-0.20(20.90))=0
We add all the numbers together, and all the variables
-(9(0.08m+20.90-0.20(20.9))+269.64=0
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