(related to Proposition: Unique Solvability of \(a+x=b\))
- We first show that $x=b-a$ really is the solution of the equation $a+x=b.$
- Now, we show, this solution is the only solution of the equation.
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- Forster Otto: "Analysis 1, Differential- und Integralrechnung einer Veränderlichen", Vieweg Studium, 1983