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4-((15/3)*x^2)+60 = 0
4-5*x^2+60 = 0
-5*x^2 = -64 // : -5
x^2 = 64/5
x^2 = 64/5 // ^ 1/2
abs(x) = (64/5)^(1/2)
x = (64/5)^(1/2) or x = -(64/5)^(1/2)
x in { (64/5)^(1/2), -(64/5)^(1/2) }
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