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x in (-oo:+oo)
((3*x)/5)*x-6 = 0
3/5*x^2 = 6 // : 3/5
x^2 = 10
x^2 = 10 // ^ 1/2
abs(x) = 10^(1/2)
x = 10^(1/2) or x = -10^(1/2)
x in { 10^(1/2), -10^(1/2) }
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