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d in (-oo:+oo)
(8/9)*d = -3/7 // + -3/7
(8/9)*d-(-3/7) = 0
(8/9)*d+3/7 = 0
8/9*d+3/7 = 0 // - 3/7
8/9*d = -3/7 // : 8/9
d = -3/7/8/9
d = -27/56
d = -27/56
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