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5x + 8x - 4x = -9 - 3
9x = -12
x = -12/9 = simplificamos la tercera
x = -4/3
Respuesta :
x -4/3
5x + 3 + 8x = 4x - 9
13x + 3 = 4x - 9
13x - 4x= - 9 - 3
9x = - 12
x = - 12/9 Simplificas
x = - 4/3
Respuesta.
x = - 12/13