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x in (-oo:+oo)
(3*x+1/5)*(3*x+1/5) = 0
(3*x+1/5)^2 = 0
3*x+1/5 = 0 // - 1/5
3*x = -1/5 // : 3
x = -1/5/3
x = -1/15
x in { -1/15, -1/15 }
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