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x in (-oo:+oo)
(6-((5/2)*x))^2 = 0
((-5/2)*x+6)^2 = 0
(6-5/2*x)^2 = 0
6-5/2*x = 0 // - 6
-5/2*x = -6 // : -5/2
x = -6/(-5/2)
x = 12/5
x in { 12/5, 12/5 }
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