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x in (-oo:+oo)
(0.5*x^2)/3 = 7 // - 7
(0.5*x^2)/3-7 = 0
0.16666667*x^2 = 7 // : 0.16666667
x^2 = 41.99999916
x^2 = 41.99999916 // ^ 1/2
abs(x) = 41.99999916^(1/2)
x = 41.99999916^(1/2) or x = -41.99999916^(1/2)
x in { 41.99999916^(1/2), -41.99999916^(1/2) }
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