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x in (-oo:+oo)
((7*x)/6)*x-14 = 0
7/6*x^2 = 14 // : 7/6
x^2 = 12
x^2 = 12 // ^ 1/2
abs(x) = 2*3^(1/2)
x = 2*3^(1/2) or x = -(2*3^(1/2))
x in { 2*3^(1/2), -(2*3^(1/2)) }
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