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x in (-oo:+oo)
(1/2)^2*x = 25/9 // - 25/9
(1/2)^2*x-(25/9) = 0
(1/2)^2*x-25/9 = 0
1/4*x-25/9 = 0 // + 25/9
1/4*x = 25/9 // : 1/4
x = 25/9/1/4
x = 100/9
x = 100/9
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