The function $$\(\mathrm{f}\)$$ is defined for $$\(x \in \mathbb{R}\)$$ by $$\[ \mathrm{f}: x \mapsto a-2 x, \]$$ where $$\(a\)$$ is a constant. Express $$\(\mathrm{ff}(x)\)$$ and $$\(\mathrm{f}^{-1}(x)\)$$ in terms of $$\(a\)$$ and $$\(x\)$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

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