\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Let \(f(x) = \ln(x) + x\).
  1. Show that \(f(x) = 2\) has a unique solution \(c\) on \(]0, +\infty[\).
  2. Using a calculator, give an approximate value of \(c\) rounded to \(0.1\).

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