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5*x^2-((10/6)*x^2)-12 = 0
5*x^2+(-5/3)*x^2-12 = 0
10/3*x^2 = 12 // : 10/3
x^2 = 18/5
x^2 = 18/5 // ^ 1/2
abs(x) = (18/5)^(1/2)
x = (18/5)^(1/2) or x = -(18/5)^(1/2)
x in { (18/5)^(1/2), -(18/5)^(1/2) }
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