Solve for $a$: $\frac15|9+2a|<1$.  Express your answer in interval notation.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Solve for $a$: $\frac15|9+2a|<1$.  Express your answer in interval notation.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
(-7, -2)
Solve for $a$: $\frac15|9+2a|<1$.  Express your answer in interval notation.
train