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