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6x=15.29
x= 2.54
2)x+3x=raiz cuadrada de 130
4x=11.4
x=2.85
x^2+5x-234=0
(x+18)(x-13)=0
x=-18
x=13
___________
x^2+3x=130
x^2+3x-130=0
(x+13)(x-10)=0
x=-13
x=10
saludos