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d in (-oo:+oo)
(1/2)*d+1/9 = -2/9 // + -2/9
(1/2)*d+1/9-(-2/9) = 0
(1/2)*d+1/9+2/9 = 0
1/2*d+1/3 = 0 // - 1/3
1/2*d = -1/3 // : 1/2
d = -1/3/1/2
d = -2/3
d = -2/3
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