5.5 The Substitution Rule/1

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Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle \begin{align} & \int{e^{-x}} dx \\[2ex],u=-x & \int{e^{-x}} dx \\[2ex] \end{align} }