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((((x*x)-14)*3)+3)RAIZ= 3
ELEVAS AMBOS LADOS AL CUADRADO Y ELIMINAS LA RAIZ
((3(x*x)- 42)+3)=9
(3(x*x)-39)=9
3(x*x)=9+39
3(x*x)=48
(x*x)=48/3
(x*x)= 16
SACAS LA RAIZ DE AMBOS LADOS
X=4