19 – A equação [tex] \begin{gathered} \begin{gathered} \:   \overline{ \boxed{\boxed{ \begin{array}{r}\mathsf{ \dfrac{x \: + \: 2}{x \: - \: 1} \: + \: \dfrac{x \: - \: 1}{x \: + \: a} \: = \: x}\end{array}}}} \end{gathered}  \end{gathered} [/tex] tem solução para x = – 1 . Nessas condições, determine o valor de a.​
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