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11x+14-7x-5 = 39-x
4x + 9 = 39-x
4x + x = 39 - 9
5x = 30
x = 30/5
x = 6 Respuesta :)
Verificando:
11(6) + 14 -7(6) - 5 = 39 - 6
66 + 14 - 42 - 5 = 33
80 -47 = 33
33 = 33 lo que queremos demostrar jejeje