Răspuns :

[tex] \dfrac{1}{2x}= \dfrac{3x}{36} <=>6 x^{2} =36<=> x^{2} =6 => x_{1} =- \sqrt{6}, x_{2} = \sqrt{6} [/tex]
1/2x=3x/36 . Simplifici a doua fractie cu 3 => 1/2x = 1/12 . Inmultesti 1*12 = 2x*1x => 2x patrat = 12 => x patrat =12/2 => x = radical din 6.