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x in (-oo:+oo)
70*(1/3)*x*x = 233330 // - 233330
70*(1/3)*x*x-233330 = 0
70/3*x^2 = 233330 // : 70/3
x^2 = 69999/7
x^2 = 69999/7 // ^ 1/2
abs(x) = (69999/7)^(1/2)
x = (69999/7)^(1/2) or x = -(69999/7)^(1/2)
x in { (69999/7)^(1/2), -(69999/7)^(1/2) }
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