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x in (-oo:+oo)
(1/2)*x+8/9 = 25/18 // - 25/18
(1/2)*x+8/9-(25/18) = 0
(1/2)*x+8/9-25/18 = 0
1/2*x-1/2 = 0 // + 1/2
1/2*x = 1/2 // : 1/2
x = 1/2/1/2
x = 1
x = 1
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