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d in (-oo:+oo)
(-2/7)*d-(4*d)+10 = 470/77 // - 470/77
(-2/7)*d-(4*d)-(470/77)+10 = 0
(-2/7)*d-4*d-470/77+10 = 0
300/77-30/7*d = 0 // - 300/77
-30/7*d = -300/77 // : -30/7
d = -300/77/(-30/7)
d = 10/11
d = 10/11
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