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