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+\documentclass{article}
+\usepackage{german}
+\setlength{\textwidth}{140mm}
+\begin{document}
+Die inverse Funktion der Reihenentwicklung~~$y = f(x) = ax+bx^2+cx^3
++dx^4 + ex^5 + fx^6+\cdots$ $(a\ne0)$ beginnt mit den Gliedern:
+\setlength{\arraycolsep}{2pt}
+\begin{eqnarray*}
+x = \varphi(y) = \frac{1}{a}y &-& \frac{b}{a^3}y^2 + \frac{1}{a^5}(2b^2-ac)y^3\\
+ &+&\frac{1}{a^7}(5abc - z^2d -fb^3)y^4
+ +\frac{1}{a^9}(6a^2bd + 3a^2c^2+14b^4 - a^3e - 21ab^2c)y^5\\
+ &+&\frac{1}{a^{11}}(7a^3be + 7a^3cd + 84ab^3c - a^4f - 28a^2b^2d
+ -28 a^2bc^2 - 43b^5)y^6 + \cdots
+\end{eqnarray*}
+\end{document}