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((4*x)/3)*x-15 = 0
4/3*x^2 = 15 // : 4/3
x^2 = 45/4
x^2 = 45/4 // ^ 1/2
abs(x) = (45/4)^(1/2)
x = (45/4)^(1/2) or x = -(45/4)^(1/2)
x in { (45/4)^(1/2), -(45/4)^(1/2) }
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