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d in (-oo:+oo)
(5/9)*(d-12) = 10 // - 10
(5/9)*(d-12)-10 = 0
5/9*(d-12)-10 = 0
5/9*(d-12)-10 = 0
5/9*d-50/3 = 0
5/9*d-50/3 = 0
5/9*d-50/3 = 0 // + 50/3
5/9*d = 50/3 // : 5/9
d = 50/3/5/9
d = 30
d = 30
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