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(9*x^2-(16/16))*(((16*x)/12)*x-16) = 0
(9*x^2-1)*(((16*x)/12)*x-16) = 0
(9*x^2-1)*(4/3*x^2-16) = 0
( 4/3*x^2-16 )
4/3*x^2 = 16 // : 4/3
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))
( 9*x^2-1 )
9*x^2 = 1 // : 9
x^2 = 1/9
x^2 = 1/9 // ^ 1/2
abs(x) = 1/3
x = 1/3 or x = -1/3
x in { 2*3^(1/2), -(2*3^(1/2)), 1/3, -1/3 }
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