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d in (-oo:+oo)
(5/9)*d+83 = (4/9)*d+92 // - (4/9)*d+92
(5/9)*d-((4/9)*d)-92+83 = 0
(5/9)*d+(-4/9)*d-92+83 = 0
1/9*d-9 = 0 // + 9
1/9*d = 9 // : 1/9
d = 9/1/9
d = 81
d = 81
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