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x in (-oo:+oo)
((3*x)/7)*x-2 = 0
3/7*x^2 = 2 // : 3/7
x^2 = 14/3
x^2 = 14/3 // ^ 1/2
abs(x) = (14/3)^(1/2)
x = (14/3)^(1/2) or x = -(14/3)^(1/2)
x in { (14/3)^(1/2), -(14/3)^(1/2) }
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