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-10n^2-5(3-n)(2n+11)=-30n
We move all terms to the left:
-10n^2-5(3-n)(2n+11)-(-30n)=0
We add all the numbers together, and all the variables
-10n^2-5(-1n+3)(2n+11)-(-30n)=0
We get rid of parentheses
-10n^2-5(-1n+3)(2n+11)+30n=0
We multiply parentheses ..
-10n^2-5(-2n^2-11n+6n+33)+30n=0
We multiply parentheses
-10n^2+10n^2+55n-30n+30n-165=0
We add all the numbers together, and all the variables
55n-165=0
We move all terms containing n to the left, all other terms to the right
55n=165
n=165/55
n=3
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