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