Exercício sobre funções

(MACKENZIE) Se $\,f\,$ é tal que $\,f(x\,+\,1) = {\dfrac{\;3x\,+\,5\;}{\;2x\,+\,1\;}},\,x\,\neq\,\dfrac{\;-1\;}{\;2\;}\,$, então o domínio de $\,f\,$ é:

$\,\mathbb{R}\,-\,\lbrace \, \frac{1}{2}\,\rbrace\phantom{X}$

$\,\mathbb{R}\,-\,\lbrace \, \frac{-1}{2}\,\rbrace\,$

$\,\mathbb{R}\,-\,\lbrace \, \frac{-5}{3}\,\rbrace\,$

$\,\mathbb{R}\,-\,\lbrace \, \frac{5}{3}\,\rbrace\,$

$\,\mathbb{R}\,-\,\lbrace \, \frac{-3}{5}\,\rbrace\,$

resposta: (A)
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