The equation is 2(3a+4)(a-6)-(3-a)^2+4(5-a) and apparently the answer is 5a^2-26a-37. How do you get to the answer??

2(3a+4)(a-6)-(3-a)^2+4(5-a)

(6a+8)(a-6)-(9-6a+a^{2})+20-4a

6a^{2}-36a+8a-48-9+6a-a^{2}+20-4a

6a^{2}-a^{2}-36a+8a+6a-4a-48-9+20

5a^{2}-26a-37

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