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x in (-oo:+oo)
((((2/3)*x)/7)/12)*x = 2 // - 2
((((2/3)*x)/7)/12)*x-2 = 0
1/126*x^2 = 2 // : 1/126
x^2 = 252
x^2 = 252 // ^ 1/2
abs(x) = 6*7^(1/2)
x = 6*7^(1/2) or x = -(6*7^(1/2))
x in { 6*7^(1/2), -(6*7^(1/2)) }
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