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