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x in (-oo:+oo)
((-2*x)/(-3))*x = 10 // - 10
((-2*x)/(-3))*x-10 = 0
2/3*x^2 = 10 // : 2/3
x^2 = 15
x^2 = 15 // ^ 1/2
abs(x) = 15^(1/2)
x = 15^(1/2) or x = -15^(1/2)
x in { 15^(1/2), -15^(1/2) }
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