Simplify the expression $$(x^5+3x^2+3x^5)-(x^7+2x^2+6x^5).$$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Simplify the expression $$(x^5+3x^2+3x^5)-(x^7+2x^2+6x^5).$$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-x^7-2x^5+x^2
Simplify the expression $$(x^5+3x^2+3x^5)-(x^7+2x^2+6x^5).$$
train