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x in (-oo:+oo)
(x/3)*x+3 = 2/7 // - 2/7
(x/3)*x-(2/7)+3 = 0
(x/3)*x-2/7+3 = 0
1/3*x^2 = -19/7 // : 1/3
x^2 = -57/7
x belongs to the empty set
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