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-9(1=10n)=2(3n+9)=
We move all terms to the left:
-9(1-(10n))=0
We add all the numbers together, and all the variables
-9(-10n+1)=0
We multiply parentheses
90n-9=0
We move all terms containing n to the left, all other terms to the right
90n=9
n=9/90
n=1/10
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