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d in (-oo:+oo)
(-5/7)*d = 45/77 // - 45/77
(-5/7)*d-(45/77) = 0
(-5/7)*d-45/77 = 0
-5/7*d-45/77 = 0 // + 45/77
-5/7*d = 45/77 // : -5/7
d = 45/77/(-5/7)
d = -9/11
d = -9/11
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