Respuesta:
3 x + 9 - 4 x = (x + 1) - (-x + 1)
9 - x = 2 x
9 - 3 x = 0
x = 3
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Respuesta:
Aporte
3 x + 9 - 4 x = (x + 1) - (-x + 1)
Resultado
9 - x = 2 x
Forma alternativa
9 - 3 x = 0
Solución
x = 3