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