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5x + 21 = 3x - 11
5x - 3x = - 11 - 21
2x = -32
x = - 32 : 2
x= -16
verificamos
5 * (-16) + 21 = 3 *(-16) - 11
- 59 = -59
respuesta: el nº es -16
suerte
saludos