Answer :

same problem, written slightly different
(2n*2)-9n/(2n*2)-5n-12=4
multiply the parentheses
4n-9n/4n-5n-12=4
simplify
-5n/-n-12=4
cancel out the n's
4n/-12=4
flip and multiply sides
-48/4n
simplify
-12/n

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