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15-(((3*x)/2)*x)-5 = 0
(-3/2)*x^2-5+15 = 0
-3/2*x^2 = -10 // : -3/2
x^2 = 20/3
x^2 = 20/3 // ^ 1/2
abs(x) = (20/3)^(1/2)
x = (20/3)^(1/2) or x = -(20/3)^(1/2)
x in { (20/3)^(1/2), -(20/3)^(1/2) }
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