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x in (-oo:+oo)
(3/5)*x^2-(((q/18)/25)*x^2)-(5*q) = 0
(-1/450)*q*x^2-5*q+(3/5)*x^2 = 0
3/5*x^2-1/450*q*x^2-5*q = 0
t_1 = x^2
3/5*t_1^1-5*q-1/450*q*t_1^1 = 0
3/5*t_1-5*q = 0 // + -5*q
3/5*t_1 = -(-5*q) // : 3/5
t_1 = (-(-5*q))/3/5
t_1 = 25/3*q
t_1 = 25/3*q
x^2-(25/3*q) = 0
x^2-25/3*q = 0
1*x^2 = -(-25/3*q) // : 1
x^2 = 25/3*q
x^2 = 25/3*q // ^ 1/2
abs(x) = (25/3)^(1/2)*q^(1/2)
x = (25/3)^(1/2)*q^(1/2) or x = -((25/3)^(1/2)*q^(1/2))
x in { (25/3)^(1/2)*q^(1/2), -((25/3)^(1/2)*q^(1/2)) }
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