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9+3n=4+5-6
We move all terms to the left:
9+3n-(4+5-6)=0
We add all the numbers together, and all the variables
3n+9-3=0
We add all the numbers together, and all the variables
3n+6=0
We move all terms containing n to the left, all other terms to the right
3n=-6
n=-6/3
n=-2
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