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x=8
espero y te sirvaaaaaa:)
3x^2-6+3=45
3x^2=45+6-3
3x^2=36
x^2=36/3
x^2=12...... raiz cuadrada a ambos terminos
raiz(x^2)=raiz(12)
x=+raiz(12)
x=-raiz(12)
saludos