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d in (-oo:+oo)
(4/9)*d = -2/9 // + -2/9
(4/9)*d-(-2/9) = 0
(4/9)*d+2/9 = 0
4/9*d+2/9 = 0 // - 2/9
4/9*d = -2/9 // : 4/9
d = -2/9/4/9
d = -1/2
d = -1/2
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