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d in (-oo:+oo)
(2/3)*d = -4/9 // + -4/9
(2/3)*d-(-4/9) = 0
(2/3)*d+4/9 = 0
2/3*d+4/9 = 0 // - 4/9
2/3*d = -4/9 // : 2/3
d = -4/9/2/3
d = -2/3
d = -2/3
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