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7n=-9+10n
We move all terms to the left:
7n-(-9+10n)=0
We add all the numbers together, and all the variables
7n-(10n-9)=0
We get rid of parentheses
7n-10n+9=0
We add all the numbers together, and all the variables
-3n+9=0
We move all terms containing n to the left, all other terms to the right
-3n=-9
n=-9/-3
n=+3
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