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x in (-oo:+oo)
(-(3*x)-1/10)^2 = 0
(-3*x-1/10)^2 = 0
-3*x-1/10 = 0 // + 1/10
-3*x = 1/10 // : -3
x = 1/10/(-3)
x = -1/30
x in { -1/30, -1/30 }
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