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[tex]\bold{2 - (x + 1) = 3(x - 1) + 8} \\ \\ \bold{2 - x - 1 = 3x - 3 + 8} \\ \\ \bold{1 - x = 3x + 5} \\ \\ \bold{ - x - 3x = 5 - 1} \\ \\ \bold{ - 4x = 4} \\ \\ \boxed{\bold{→x = - 1}}[/tex]
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Buenas
[tex]\bold{2 - (x + 1) = 3(x - 1) + 8} \\ \\ \bold{2 - x - 1 = 3x - 3 + 8} \\ \\ \bold{1 - x = 3x + 5} \\ \\ \bold{ - x - 3x = 5 - 1} \\ \\ \bold{ - 4x = 4} \\ \\ \boxed{\bold{→x = - 1}}[/tex]