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x in (-oo:+oo)
(1/2)*x-(4/9) = -1 // + 1
(1/2)*x-(4/9)+1 = 0
(1/2)*x-4/9+1 = 0
1/2*x+5/9 = 0 // - 5/9
1/2*x = -5/9 // : 1/2
x = -5/9/1/2
x = -10/9
x = -10/9
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