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((12*x)/5)*x-20 = 0
12/5*x^2 = 20 // : 12/5
x^2 = 25/3
x^2 = 25/3 // ^ 1/2
abs(x) = (25/3)^(1/2)
x = (25/3)^(1/2) or x = -(25/3)^(1/2)
x in { (25/3)^(1/2), -(25/3)^(1/2) }
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