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-3m+27=0
36-3m=0
36=3m
12=m
listo :D
x² - mx + 27 = 0 Para x = 3
(3)² - 3m + 27 = 0
9 - 3m + 27 = 0
36 - 3m = 0
36 = 3m
36/3 = m
12 = m
Respuesta.
m = 12