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X^2 + x =30
primero igualamos a cero
X^2 + x -30=0
x 6 / 6x
x -5 / -5x
____
x
entonces solo despejas el x
(x+6) (x-5) =0
x+6=0 y x-5=0
x= -6 y x=5
respuesta= (-6 , 5)