Answer:
12y^2+5y-9x^2+3x+9
Explanation:
(12y^2+5y-6)-(9x^2-3x-4)+11
12y^2+5y-6-9x^2+3x+4+11
12y^2+5y-9x^2+3x-6+4+11
12y^2+5y-9x^2+3x-2+11
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