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x in (-oo:+oo)
(x/15)*x = 85 // - 85
(x/15)*x-85 = 0
1/15*x^2 = 85 // : 1/15
x^2 = 1275
x^2 = 1275 // ^ 1/2
abs(x) = 5*51^(1/2)
x = 5*51^(1/2) or x = -(5*51^(1/2))
x in { 5*51^(1/2), -(5*51^(1/2)) }
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