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d in (-oo:+oo)
(7/9)*d-7 = (5/9)*d-3 // - (5/9)*d-3
(7/9)*d-((5/9)*d)-7+3 = 0
(7/9)*d+(-5/9)*d-7+3 = 0
2/9*d-4 = 0 // + 4
2/9*d = 4 // : 2/9
d = 4/2/9
d = 18
d = 18
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