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x in (-oo:+oo)
((2/3)*x-4)^2 = 64 // - 64
((2/3)*x-4)^2-64 = 0
(2/3*x-4)^2-64 = 0
(2/3*x-4)^2-64 = 0
4/9*x^2-16/3*x-48 = 0
4/9*x^2-16/3*x-48 = 0
4*(1/9*x^2-4/3*x-12) = 0
1/9*x^2-4/3*x-12 = 0
DELTA = (-4/3)^2-(-12*1/9*4)
DELTA = 64/9
DELTA > 0
x = ((64/9)^(1/2)+4/3)/(1/9*2) or x = (4/3-(64/9)^(1/2))/(1/9*2)
x = 18 or x = -6
4*(x+6)*(x-18) = 0
4*(x+6)*(x-18) = 0
( 4 )
4 = 0
x belongs to the empty set
( x+6 )
x+6 = 0 // - 6
x = -6
( x-18 )
x-18 = 0 // + 18
x = 18
x in { -6, 18 }
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