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x in (-oo:+oo)
((1/2)*x-((6/9)*y))^3 = 0
((1/2)*x+(-2/3)*y)^3 = 0
(1/2*x-2/3*y)^3 = 0
1/2*x-2/3*y = 0 // + -2/3*y
1/2*x = -(-2/3*y) // : 1/2
x = (-(-2/3*y))/1/2
x = 4/3*y
x in { 4/3*y, 4/3*y, 4/3*y }
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