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1) x*-3x-4=0
2) x*-3x-4>0
x*-3x-4=0
-3x=raiz(4)
-3x=2
x=2/-3 ---- x=-2/3
Se sustituye en la otra ecuación
-2/3 * -3(-2/3) -4>0
-2/3 * 6/3 -4 >0
-2/3* 3-4>0
-2/3* -1>0
2/3>0