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X in (-oo:+oo)
((4/5)*X-1)^2 = 4/9 // - 4/9
((4/5)*X-1)^2-(4/9) = 0
((4/5)*X-1)^2-4/9 = 0
(4/5*X-1)^2-4/9 = 0
(9*(4/5*X-1)^2)/9-4/9 = 0
9*(4/5*X-1)^2-4 = 0
144/25*X^2-72/5*X+5 = 0
144/25*X^2-72/5*X+5 = 0
144/25*X^2-72/5*X+5 = 0
DELTA = (-72/5)^2-(4*5*144/25)
DELTA = 2304/25
DELTA > 0
X = ((2304/25)^(1/2)+72/5)/(2*144/25) or X = (72/5-(2304/25)^(1/2))/(2*144/25)
X = 25/12 or X = 5/12
(X-5/12)*(X-25/12) = 0
((X-5/12)*(X-25/12))/9 = 0
((X-5/12)*(X-25/12))/9 = 0 // * 9
(X-5/12)*(X-25/12) = 0
( X-25/12 )
X-25/12 = 0 // + 25/12
X = 25/12
( X-5/12 )
X-5/12 = 0 // + 5/12
X = 5/12
X in { 25/12, 5/12 }
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