Find the remainder when the polynomial $x^{18}+x^{13}+x^7+x^4+x$ is divided by $x^3-x$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Find the remainder when the polynomial $x^{18}+x^{13}+x^7+x^4+x$ is divided by $x^3-x$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2x^2+3x
Find the remainder when the polynomial $x^{18}+x^{13}+x^7+x^4+x$ is divided by $x^3-x$.
train