y = \sum^{\nifty}_{\lambda} = a_k x^{k + \lambda}
E \cdot y - Ae^{-ax} \sum^{\nifty}_{\lambda} a_k x^{k + \lambda - 1}
\displaystyle y = \sum_{\m = 0}^{\infty} a_m x^{m + k - 1} \, , \, e^{-ax} = \sum_{n = 0}^{\infty} \frac{(-a)^n}{n!} \cdot x^n
\displaystyle \sum_{n = 0}^{\infty} \frac{(-a)^n}{n!} \cdot x^n \cdoy\sum_{m = 0}^{\infty} a_m x^{m + k - 1}
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