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5x - 9 = 4x + 11
5x - 4x = 11 + 9
x = 20
El valor de x es 20
3x + 2x - 9 = 4x + 11
5x - 9 = 4x + 11
5x - 4x = 11 + 9
x = 20
Respuesta.
x = 20