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3(5-2n)+9=
We move all terms to the left:
3(5-2n)+9-()=0
We add all the numbers together, and all the variables
3(-2n+5)+9-()=0
We add all the numbers together, and all the variables
3(-2n+5)=0
We multiply parentheses
-6n+15=0
We move all terms containing n to the left, all other terms to the right
-6n=-15
n=-15/-6
n=2+1/2
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