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d in (-oo:+oo)
(7/6)*(6*d-18)-23 = 19 // - 19
(7/6)*(6*d-18)-23-19 = 0
7/6*(6*d-18)-23-19 = 0
7/6*(6*d-18)-23-19 = 0
7*d-44-19 = 0
7*d-63 = 0
7*d-63 = 0
7*d-63 = 0 // + 63
7*d = 63 // : 7
d = 63/7
d = 9
d = 9
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