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x in (-oo:+oo)
(-x/20-(5/2))^2 = 0
(-x/20-5/2)^2 = 0
(-1/20*x-5/2)^2 = 0
-1/20*x-5/2 = 0 // + 5/2
-1/20*x = 5/2 // : -1/20
x = 5/2/(-1/20)
x = -50
x in { -50, -50 }
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