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3n-9=2(6+5n)
We move all terms to the left:
3n-9-(2(6+5n))=0
We add all the numbers together, and all the variables
3n-(2(5n+6))-9=0
We calculate terms in parentheses: -(2(5n+6)), so:We get rid of parentheses
2(5n+6)
We multiply parentheses
10n+12
Back to the equation:
-(10n+12)
3n-10n-12-9=0
We add all the numbers together, and all the variables
-7n-21=0
We move all terms containing n to the left, all other terms to the right
-7n=21
n=21/-7
n=-3
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