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d in (-oo:+oo)
(4/7)*d+(1/2)*d+2/5 = 89/35 // - 89/35
(4/7)*d+(1/2)*d+2/5-(89/35) = 0
(4/7)*d+(1/2)*d+2/5-89/35 = 0
15/14*d-15/7 = 0 // + 15/7
15/14*d = 15/7 // : 15/14
d = 15/7/15/14
d = 2
d = 2
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