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x in (-oo:+oo)
(x-(2/3))^2 = 25/16 // - 25/16
(x-(2/3))^2-(25/16) = 0
(x-2/3)^2-25/16 = 0
(16*(x-2/3)^2)/16-25/16 = 0
16*(x-2/3)^2-25 = 0
16*x^2-64/3*x-161/9 = 0
16*x^2-64/3*x-161/9 = 0
16*x^2-64/3*x-161/9 = 0
DELTA = (-64/3)^2-(-161/9*4*16)
DELTA = 1600
DELTA > 0
x = (1600^(1/2)+64/3)/(2*16) or x = (64/3-1600^(1/2))/(2*16)
x = 23/12 or x = -7/12
(x+7/12)*(x-23/12) = 0
((x+7/12)*(x-23/12))/16 = 0
((x+7/12)*(x-23/12))/16 = 0 // * 16
(x+7/12)*(x-23/12) = 0
( x+7/12 )
x+7/12 = 0 // - 7/12
x = -7/12
( x-23/12 )
x-23/12 = 0 // + 23/12
x = 23/12
x in { -7/12, 23/12 }
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