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9n=10n+7
We move all terms to the left:
9n-(10n+7)=0
We get rid of parentheses
9n-10n-7=0
We add all the numbers together, and all the variables
-1n-7=0
We move all terms containing n to the left, all other terms to the right
-n=7
n=7/-1
n=-7
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