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((3*x)/5)*x-10 = 0
3/5*x^2 = 10 // : 3/5
x^2 = 50/3
x^2 = 50/3 // ^ 1/2
abs(x) = (50/3)^(1/2)
x = (50/3)^(1/2) or x = -(50/3)^(1/2)
x in { (50/3)^(1/2), -(50/3)^(1/2) }
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